About the Number

733521552192

733521552191 ← → 733521552193

2進数表記:1010101011001001010010101010001101000000

漢数字表記:七千三百三十五億二千百五十五万二千百九十二

素因数分解:

2 6 × 3 4 × 11 1 × 13 1 × 37 1 × 47 1 × 569 1

素因数の和:701
約数の個数: 1120
約数和(自身を含む): 2684096110080
約数和(自身を除く): 1950574557888

約数列:
[1, 2, 3, 4, 6, 8, 9, 11, 12, 13, 16, 18, 22, 24, 26, 27, 32, 33, 36, 37, 39, 44, 47, 48, 52, 54, 64, 66, 72, 74, 78, 81, 88, 94, 96, 99, 104, 108, 111, 117, 132, 141, 143, 144, 148, 156, 162, 176, 188, 192, 198, 208, 216, 222, 234, 264, 282, 286, 288, 296, 297, 312, 324, 333, 351, 352, 376, 396, 407, 416, 423, 429, 432, 444, 468, 481, 517, 528, 564, 569, 572, 576, 592, 594, 611, 624, 648, 666, 702, 704, 752, 792, 814, 832, 846, 858, 864, 888, 891, 936, 962, 999, 1034, 1053, 1056, 1128, 1138, 1144, 1184, 1188, 1221, 1222, 1248, 1269, 1287, 1296, 1332, 1404, 1443, 1504, 1551, 1584, 1628, 1692, 1707, 1716, 1728, 1739, 1776, 1782, 1833, 1872, 1924, 1998, 2068, 2106, 2112, 2256, 2276, 2288, 2368, 2376, 2442, 2444, 2496, 2538, 2574, 2592, 2664, 2808, 2886, 2997, 3008, 3102, 3168, 3256, 3384, 3414, 3432, 3478, 3552, 3564, 3663, 3666, 3744, 3807, 3848, 3861, 3996, 4136, 4212, 4329, 4512, 4552, 4576, 4653, 4752, 4884, 4888, 5076, 5121, 5148, 5184, 5217, 5291, 5328, 5499, 5616, 5772, 5994, 6204, 6259, 6336, 6512, 6721, 6768, 6828, 6864, 6956, 7104, 7128, 7326, 7332, 7397, 7488, 7614, 7696, 7722, 7992, 8272, 8424, 8658, 9024, 9104, 9152, 9306, 9504, 9768, 9776, 10152, 10242, 10296, 10434, 10582, 10656, 10989, 10998, 11232, 11544, 11583, 11988, 12408, 12518, 12987, 13024, 13442, 13536, 13656, 13728, 13912, 13959, 14256, 14652, 14664, 14794, 15228, 15363, 15392, 15444, 15651, 15873, 15984, 16497, 16544, 16848, 17316, 18208, 18612, 18777, 19008, 19129, 19536, 19552, 20163, 20304, 20484, 20592, 20868, 21053, 21164, 21312, 21978, 21996, 22191, 22464, 22607, 23088, 23166, 23976, 24816, 25036, 25974, 26048, 26743, 26884, 27072, 27312, 27456, 27824, 27918, 28512, 29304, 29328, 29588, 30456, 30726, 30784, 30888, 31302, 31746, 31968, 32967, 32994, 33088, 33696, 34632, 36416, 37224, 37554, 38258, 38961, 39072, 39104, 40326, 40608, 40968, 41184, 41736, 41877, 42106, 42328, 43956, 43992, 44382, 45214, 46089, 46176, 46332, 46953, 47619, 47952, 49491, 49632, 50072, 51948, 53486, 53768, 54624, 55648, 55836, 56331, 57024, 57387, 58608, 58656, 59176, 60489, 60912, 61452, 61776, 62604, 63159, 63492, 63936, 65934, 65988, 66573, 67392, 67821, 69264, 74448, 75108, 76516, 77922, 78144, 80229, 80652, 81216, 81367, 81936, 82368, 83472, 83754, 84212, 84656, 87912, 87984, 88764, 90428, 92178, 92352, 92664, 93906, 95238, 95904, 98982, 99264, 100144, 103896, 106972, 107536, 109248, 111296, 111672, 112662, 114774, 117216, 117312, 118352, 120978, 121824, 122904, 123552, 125208, 126318, 126984, 131868, 131976, 133146, 135642, 138528, 140859, 142857, 148896, 150216, 153032, 155844, 160458, 161304, 162734, 163872, 166944, 167508, 168424, 168993, 169312, 172161, 175824, 175968, 177528, 180856, 181467, 184356, 185328, 187812, 189477, 190476, 191808, 197964, 199719, 200288, 203463, 207792, 213944, 215072, 223344, 225324, 229548, 231583, 234432, 236704, 240687, 241956, 243648, 244101, 245808, 247104, 248677, 250416, 252636, 253968, 263736, 263952, 266292, 271284, 273689, 277056, 281718, 285714, 294173, 297792, 300432, 306064, 311688, 320916, 322608, 325468, 327744, 333888, 335016, 336848, 337986, 338624, 344322, 347659, 351648, 351936, 355056, 361712, 362934, 368712, 370656, 375624, 378954, 380952, 395928, 399438, 400576, 406926, 415584, 427888, 428571, 430144, 446688, 450648, 459096, 463166, 473408, 481374, 483912, 488202, 491616, 497354, 500832, 505272, 506979, 507936, 516483, 527472, 527904, 532584, 542568, 544401, 547378, 563436, 568431, 571428, 588346, 599157, 600864, 610389, 612128, 623376, 641832, 645216, 650936, 670032, 673696, 675972, 688644, 694749, 695318, 703296, 710112, 722061, 723424, 725868, 732303, 737424, 741312, 746031, 751248, 757908, 761904, 791856, 798876, 813852, 821067, 831168, 855776, 857142, 882519, 893376, 901296, 918192, 926332, 962748, 967824, 976404, 983232, 989491, 994708, 1001664, 1010544, 1013958, 1015872, 1032966, 1042977, 1054944, 1055808, 1065168, 1085136, 1088802, 1094756, 1126872, 1136862, 1142856, 1176692, 1198314, 1201728, 1220778, 1224256, 1246752, 1283664, 1290432, 1301872, 1340064, 1347392, 1351944, 1377288, 1389498, 1390636, 1420224, 1444122, 1446848, 1451736, 1464606, 1474848, 1492062, 1502496, 1515816, 1523808, 1549449, 1583712, 1597752, 1627704, 1642134, 1705293, 1711552, 1714284, 1765038, 1802592, 1831167, 1836384, 1852664, 1925496, 1935648, 1952808, 1978982, 1989416, 2021088, 2027916, 2065932, 2084247, 2085954, 2109888, 2130336, 2166183, 2170272, 2177604, 2189512, 2196909, 2238093, 2253744, 2273724, 2285712, 2353384, 2396628, 2441556, 2463201, 2493504, 2567328, 2603744, 2647557, 2680128, 2703888, 2754576, 2778996, 2781272, 2888244, 2903472, 2929212, 2949696, 2968473, 2984124, 3004992, 3010579, 3031632, 3047616, 3098898, 3128931, 3167424, 3195504, 3255408, 3284268, 3410586, 3428568, 3530076, 3605184, 3662334, 3672768, 3705328, 3824249, 3850992, 3871296, 3905616, 3957964, 3978832, 4042176, 4055832, 4131864, 4168494, 4171908, 4260672, 4332366, 4340544, 4355208, 4379024, 4393818, 4476186, 4507488, 4547448, 4571424, 4706768, 4793256, 4883112, 4926402, 5134656, 5207488, 5295114, 5407776, 5509152, 5557992, 5562544, 5776488, 5806944, 5858424, 5936946, 5968248, 6021158, 6063264, 6197796, 6252741, 6257862, 6391008, 6510816, 6568536, 6590727, 6714279, 6821172, 6857136, 7060152, 7324668, 7389603, 7410656, 7648498, 7701984, 7811232, 7915928, 7942671, 7957664, 8111664, 8263728, 8336988, 8343816, 8664732, 8710416, 8758048, 8787636, 8905419, 8952372, 9014976, 9031737, 9094896, 9142848, 9386793, 9413536, 9586512, 9766224, 9852804, 10590228, 10815552, 10884401, 11018304, 11115984, 11125088, 11472747, 11552976, 11613888, 11716848, 11873892, 11936496, 12042316, 12126528, 12395592, 12505482, 12515724, 12782016, 12863383, 13021632, 13137072, 13181454, 13428558, 13642344, 13714272, 14120304, 14649336, 14779206, 14821312, 15296996, 15403968, 15622464, 15831856, 15885342, 15915328, 16223328, 16527456, 16673976, 16687632, 17329464, 17420832, 17516096, 17575272, 17810838, 17904744, 18063474, 18189792, 18758223, 18773586, 18827072, 19173024, 19532448, 19705608, 20142837, 21180456, 21768802, 22168809, 22231968, 22250176, 22945494, 23105952, 23433696, 23747784, 23828013, 23872992, 24084632, 24791184, 25010964, 25031448, 25726766, 26274144, 26362908, 26716257, 26857116, 27095211, 27284688, 27428544, 28160379, 28240608, 29298672, 29558412, 30593992, 31663712, 31770684, 32446656, 32653203, 33054912, 33347952, 33375264, 34418241, 34658928, 34841664, 35150544, 35621676, 35809488, 36126948, 36379584, 37516446, 37547172, 38346048, 38590149, 39064896, 39411216, 40285674, 42360912, 43537604, 44337618, 44463936, 45890988, 46211904, 46867392, 47495568, 47656026, 47745984, 48169264, 49582368, 50021928, 50062896, 51453532, 52548288, 52725816, 53432514, 53714232, 54190422, 54569376, 56320758, 56481216, 58597344, 59116824, 61187984, 63327424, 63541368, 65306406, 66695904, 66750528, 68836482, 69317856, 70301088, 71243352, 71618976, 72253896, 75032892, 75094344, 77180298, 78822432, 80148771, 80571348, 81285633, 84721824, 87075208, 88675236, 91781976, 94991136, 95312052, 96338528, 97959609, 99164736, 100043856, 100125792, 102907064, 103254723, 105451632, 106865028, 107428464, 108380844, 109138752, 112641516, 115770447, 117194688, 118233648, 122375968, 127082736, 130612812, 133391808, 137672964, 138635712, 140602176, 141497213, 142486704, 143237952, 144507792, 150065784, 150188688, 154360596, 157644864, 160297542, 161142696, 162571266, 169443648, 174150416, 177350472, 183563952, 189982272, 190624104, 192677056, 195919218, 200087712, 200251584, 205814128, 206509446, 210903264, 213730056, 214856928, 216761688, 225283032, 231540894, 236467296, 243856899, 244751936, 254165472, 261225624, 275345928, 282994426, 284973408, 289015584, 293878827, 300131568, 300377376, 308721192, 309764169, 320595084, 322285392, 325142532, 347311341, 348300832, 354700944, 367127904, 381248208, 391838436, 400175424, 411628256, 413018892, 421806528, 424491639, 427460112, 429713856, 433523376, 450566064, 463081788, 472934592, 487713798, 508330944, 522451248, 550691856, 565988852, 569946816, 578031168, 587757654, 600263136, 600754752, 617442384, 619528338, 641190168, 644570784, 650285064, 694622682, 696601664, 709401888, 734255808, 762496416, 783676872, 823256512, 826037784, 848983278, 854920224, 867046752, 881636481, 901132128, 926163576, 975427596, 1041934023, 1044902496, 1101383712, 1131977704, 1175515308, 1200526272, 1234884768, 1239056676, 1273474917, 1282380336, 1289141568, 1300570128, 1389245364, 1418803776, 1524992832, 1567353744, 1652075568, 1697966556, 1709840448, 1734093504, 1763272962, 1802264256, 1852327152, 1950855192, 2083868046, 2089804992, 2202767424, 2263955408, 2351030616, 2469769536, 2478113352, 2546949834, 2564760672, 2601140256, 2778490728, 3134707488, 3304151136, 3395933112, 3526545924, 3704654304, 3820424751, 3901710384, 4167736092, 4527910816, 4702061232, 4956226704, 5093899668, 5129521344, 5202280512, 5556981456, 6269414976, 6608302272, 6791866224, 7053091848, 7409308608, 7640849502, 7803420768, 8335472184, 9055821632, 9404122464, 9912453408, 10187799336, 11113962912, 11461274253, 13583732448, 14106183696, 15281699004, 15606841536, 16670944368, 18808244928, 19824906816, 20375598672, 22227925824, 22922548506, 27167464896, 28212367392, 30563398008, 33341888736, 40751197344, 45845097012, 56424734784, 61126796016, 66683777472, 81502394688, 91690194024, 122253592032, 183380388048, 244507184064, 366760776096, 733521552192]

約数ペア:
[(1, 733521552192), (2, 366760776096), (3, 244507184064), (4, 183380388048), (6, 122253592032), (8, 91690194024), (9, 81502394688), (11, 66683777472), (12, 61126796016), (13, 56424734784), (16, 45845097012), (18, 40751197344), (22, 33341888736), (24, 30563398008), (26, 28212367392), (27, 27167464896), (32, 22922548506), (33, 22227925824), (36, 20375598672), (37, 19824906816), (39, 18808244928), (44, 16670944368), (47, 15606841536), (48, 15281699004), (52, 14106183696), (54, 13583732448), (64, 11461274253), (66, 11113962912), (72, 10187799336), (74, 9912453408), (78, 9404122464), (81, 9055821632), (88, 8335472184), (94, 7803420768), (96, 7640849502), (99, 7409308608), (104, 7053091848), (108, 6791866224), (111, 6608302272), (117, 6269414976), (132, 5556981456), (141, 5202280512), (143, 5129521344), (144, 5093899668), (148, 4956226704), (156, 4702061232), (162, 4527910816), (176, 4167736092), (188, 3901710384), (192, 3820424751), (198, 3704654304), (208, 3526545924), (216, 3395933112), (222, 3304151136), (234, 3134707488), (264, 2778490728), (282, 2601140256), (286, 2564760672), (288, 2546949834), (296, 2478113352), (297, 2469769536), (312, 2351030616), (324, 2263955408), (333, 2202767424), (351, 2089804992), (352, 2083868046), (376, 1950855192), (396, 1852327152), (407, 1802264256), (416, 1763272962), (423, 1734093504), (429, 1709840448), (432, 1697966556), (444, 1652075568), (468, 1567353744), (481, 1524992832), (517, 1418803776), (528, 1389245364), (564, 1300570128), (569, 1289141568), (572, 1282380336), (576, 1273474917), (592, 1239056676), (594, 1234884768), (611, 1200526272), (624, 1175515308), (648, 1131977704), (666, 1101383712), (702, 1044902496), (704, 1041934023), (752, 975427596), (792, 926163576), (814, 901132128), (832, 881636481), (846, 867046752), (858, 854920224), (864, 848983278), (888, 826037784), (891, 823256512), (936, 783676872), (962, 762496416), (999, 734255808), (1034, 709401888), (1053, 696601664), (1056, 694622682), (1128, 650285064), (1138, 644570784), (1144, 641190168), (1184, 619528338), (1188, 617442384), (1221, 600754752), (1222, 600263136), (1248, 587757654), (1269, 578031168), (1287, 569946816), (1296, 565988852), (1332, 550691856), (1404, 522451248), (1443, 508330944), (1504, 487713798), (1551, 472934592), (1584, 463081788), (1628, 450566064), (1692, 433523376), (1707, 429713856), (1716, 427460112), (1728, 424491639), (1739, 421806528), (1776, 413018892), (1782, 411628256), (1833, 400175424), (1872, 391838436), (1924, 381248208), (1998, 367127904), (2068, 354700944), (2106, 348300832), (2112, 347311341), (2256, 325142532), (2276, 322285392), (2288, 320595084), (2368, 309764169), (2376, 308721192), (2442, 300377376), (2444, 300131568), (2496, 293878827), (2538, 289015584), (2574, 284973408), (2592, 282994426), (2664, 275345928), (2808, 261225624), (2886, 254165472), (2997, 244751936), (3008, 243856899), (3102, 236467296), (3168, 231540894), (3256, 225283032), (3384, 216761688), (3414, 214856928), (3432, 213730056), (3478, 210903264), (3552, 206509446), (3564, 205814128), (3663, 200251584), (3666, 200087712), (3744, 195919218), (3807, 192677056), (3848, 190624104), (3861, 189982272), (3996, 183563952), (4136, 177350472), (4212, 174150416), (4329, 169443648), (4512, 162571266), (4552, 161142696), (4576, 160297542), (4653, 157644864), (4752, 154360596), (4884, 150188688), (4888, 150065784), (5076, 144507792), (5121, 143237952), (5148, 142486704), (5184, 141497213), (5217, 140602176), (5291, 138635712), (5328, 137672964), (5499, 133391808), (5616, 130612812), (5772, 127082736), (5994, 122375968), (6204, 118233648), (6259, 117194688), (6336, 115770447), (6512, 112641516), (6721, 109138752), (6768, 108380844), (6828, 107428464), (6864, 106865028), (6956, 105451632), (7104, 103254723), (7128, 102907064), (7326, 100125792), (7332, 100043856), (7397, 99164736), (7488, 97959609), (7614, 96338528), (7696, 95312052), (7722, 94991136), (7992, 91781976), (8272, 88675236), (8424, 87075208), (8658, 84721824), (9024, 81285633), (9104, 80571348), (9152, 80148771), (9306, 78822432), (9504, 77180298), (9768, 75094344), (9776, 75032892), (10152, 72253896), (10242, 71618976), (10296, 71243352), (10434, 70301088), (10582, 69317856), (10656, 68836482), (10989, 66750528), (10998, 66695904), (11232, 65306406), (11544, 63541368), (11583, 63327424), (11988, 61187984), (12408, 59116824), (12518, 58597344), (12987, 56481216), (13024, 56320758), (13442, 54569376), (13536, 54190422), (13656, 53714232), (13728, 53432514), (13912, 52725816), (13959, 52548288), (14256, 51453532), (14652, 50062896), (14664, 50021928), (14794, 49582368), (15228, 48169264), (15363, 47745984), (15392, 47656026), (15444, 47495568), (15651, 46867392), (15873, 46211904), (15984, 45890988), (16497, 44463936), (16544, 44337618), (16848, 43537604), (17316, 42360912), (18208, 40285674), (18612, 39411216), (18777, 39064896), (19008, 38590149), (19129, 38346048), (19536, 37547172), (19552, 37516446), (20163, 36379584), (20304, 36126948), (20484, 35809488), (20592, 35621676), (20868, 35150544), (21053, 34841664), (21164, 34658928), (21312, 34418241), (21978, 33375264), (21996, 33347952), (22191, 33054912), (22464, 32653203), (22607, 32446656), (23088, 31770684), (23166, 31663712), (23976, 30593992), (24816, 29558412), (25036, 29298672), (25974, 28240608), (26048, 28160379), (26743, 27428544), (26884, 27284688), (27072, 27095211), (27312, 26857116), (27456, 26716257), (27824, 26362908), (27918, 26274144), (28512, 25726766), (29304, 25031448), (29328, 25010964), (29588, 24791184), (30456, 24084632), (30726, 23872992), (30784, 23828013), (30888, 23747784), (31302, 23433696), (31746, 23105952), (31968, 22945494), (32967, 22250176), (32994, 22231968), (33088, 22168809), (33696, 21768802), (34632, 21180456), (36416, 20142837), (37224, 19705608), (37554, 19532448), (38258, 19173024), (38961, 18827072), (39072, 18773586), (39104, 18758223), (40326, 18189792), (40608, 18063474), (40968, 17904744), (41184, 17810838), (41736, 17575272), (41877, 17516096), (42106, 17420832), (42328, 17329464), (43956, 16687632), (43992, 16673976), (44382, 16527456), (45214, 16223328), (46089, 15915328), (46176, 15885342), (46332, 15831856), (46953, 15622464), (47619, 15403968), (47952, 15296996), (49491, 14821312), (49632, 14779206), (50072, 14649336), (51948, 14120304), (53486, 13714272), (53768, 13642344), (54624, 13428558), (55648, 13181454), (55836, 13137072), (56331, 13021632), (57024, 12863383), (57387, 12782016), (58608, 12515724), (58656, 12505482), (59176, 12395592), (60489, 12126528), (60912, 12042316), (61452, 11936496), (61776, 11873892), (62604, 11716848), (63159, 11613888), (63492, 11552976), (63936, 11472747), (65934, 11125088), (65988, 11115984), (66573, 11018304), (67392, 10884401), (67821, 10815552), (69264, 10590228), (74448, 9852804), (75108, 9766224), (76516, 9586512), (77922, 9413536), (78144, 9386793), (80229, 9142848), (80652, 9094896), (81216, 9031737), (81367, 9014976), (81936, 8952372), (82368, 8905419), (83472, 8787636), (83754, 8758048), (84212, 8710416), (84656, 8664732), (87912, 8343816), (87984, 8336988), (88764, 8263728), (90428, 8111664), (92178, 7957664), (92352, 7942671), (92664, 7915928), (93906, 7811232), (95238, 7701984), (95904, 7648498), (98982, 7410656), (99264, 7389603), (100144, 7324668), (103896, 7060152), (106972, 6857136), (107536, 6821172), (109248, 6714279), (111296, 6590727), (111672, 6568536), (112662, 6510816), (114774, 6391008), (117216, 6257862), (117312, 6252741), (118352, 6197796), (120978, 6063264), (121824, 6021158), (122904, 5968248), (123552, 5936946), (125208, 5858424), (126318, 5806944), (126984, 5776488), (131868, 5562544), (131976, 5557992), (133146, 5509152), (135642, 5407776), (138528, 5295114), (140859, 5207488), (142857, 5134656), (148896, 4926402), (150216, 4883112), (153032, 4793256), (155844, 4706768), (160458, 4571424), (161304, 4547448), (162734, 4507488), (163872, 4476186), (166944, 4393818), (167508, 4379024), (168424, 4355208), (168993, 4340544), (169312, 4332366), (172161, 4260672), (175824, 4171908), (175968, 4168494), (177528, 4131864), (180856, 4055832), (181467, 4042176), (184356, 3978832), (185328, 3957964), (187812, 3905616), (189477, 3871296), (190476, 3850992), (191808, 3824249), (197964, 3705328), (199719, 3672768), (200288, 3662334), (203463, 3605184), (207792, 3530076), (213944, 3428568), (215072, 3410586), (223344, 3284268), (225324, 3255408), (229548, 3195504), (231583, 3167424), (234432, 3128931), (236704, 3098898), (240687, 3047616), (241956, 3031632), (243648, 3010579), (244101, 3004992), (245808, 2984124), (247104, 2968473), (248677, 2949696), (250416, 2929212), (252636, 2903472), (253968, 2888244), (263736, 2781272), (263952, 2778996), (266292, 2754576), (271284, 2703888), (273689, 2680128), (277056, 2647557), (281718, 2603744), (285714, 2567328), (294173, 2493504), (297792, 2463201), (300432, 2441556), (306064, 2396628), (311688, 2353384), (320916, 2285712), (322608, 2273724), (325468, 2253744), (327744, 2238093), (333888, 2196909), (335016, 2189512), (336848, 2177604), (337986, 2170272), (338624, 2166183), (344322, 2130336), (347659, 2109888), (351648, 2085954), (351936, 2084247), (355056, 2065932), (361712, 2027916), (362934, 2021088), (368712, 1989416), (370656, 1978982), (375624, 1952808), (378954, 1935648), (380952, 1925496), (395928, 1852664), (399438, 1836384), (400576, 1831167), (406926, 1802592), (415584, 1765038), (427888, 1714284), (428571, 1711552), (430144, 1705293), (446688, 1642134), (450648, 1627704), (459096, 1597752), (463166, 1583712), (473408, 1549449), (481374, 1523808), (483912, 1515816), (488202, 1502496), (491616, 1492062), (497354, 1474848), (500832, 1464606), (505272, 1451736), (506979, 1446848), (507936, 1444122), (516483, 1420224), (527472, 1390636), (527904, 1389498), (532584, 1377288), (542568, 1351944), (544401, 1347392), (547378, 1340064), (563436, 1301872), (568431, 1290432), (571428, 1283664), (588346, 1246752), (599157, 1224256), (600864, 1220778), (610389, 1201728), (612128, 1198314), (623376, 1176692), (641832, 1142856), (645216, 1136862), (650936, 1126872), (670032, 1094756), (673696, 1088802), (675972, 1085136), (688644, 1065168), (694749, 1055808), (695318, 1054944), (703296, 1042977), (710112, 1032966), (722061, 1015872), (723424, 1013958), (725868, 1010544), (732303, 1001664), (737424, 994708), (741312, 989491), (746031, 983232), (751248, 976404), (757908, 967824), (761904, 962748), (791856, 926332), (798876, 918192), (813852, 901296), (821067, 893376), (831168, 882519), (855776, 857142)]

このpageの処理時間: 2.8559558391571045 seconds