About the Number
183894274200
2進数表記:10101011010000111100111111000010011000
漢数字表記:千八百三十八億九千四百二十七万四千二百
素因数分解:
素因数の和:253
約数の個数: 1152
約数和(自身を含む): 741102566400
約数和(自身を除く): 557208292200
約数列:
[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 15, 20, 21, 24, 25, 26, 28, 30, 35, 39, 40, 41, 42, 50, 52, 56, 60, 65, 70, 71, 75, 78, 82, 84, 89, 91, 100, 104, 105, 120, 123, 130, 140, 142, 150, 156, 164, 168, 169, 175, 178, 182, 195, 200, 205, 210, 213, 246, 260, 267, 273, 280, 284, 287, 300, 312, 325, 328, 338, 350, 355, 356, 364, 390, 410, 420, 426, 445, 455, 492, 497, 507, 520, 525, 533, 534, 546, 568, 574, 600, 615, 623, 650, 676, 700, 710, 712, 728, 780, 820, 840, 845, 852, 861, 890, 910, 923, 975, 984, 994, 1014, 1025, 1050, 1065, 1066, 1068, 1092, 1148, 1157, 1183, 1230, 1246, 1300, 1335, 1352, 1365, 1400, 1420, 1435, 1491, 1560, 1599, 1640, 1690, 1704, 1722, 1775, 1780, 1820, 1846, 1869, 1950, 1988, 2028, 2050, 2100, 2130, 2132, 2136, 2184, 2225, 2275, 2296, 2314, 2366, 2460, 2485, 2492, 2535, 2600, 2665, 2670, 2730, 2769, 2840, 2870, 2911, 2982, 3075, 3115, 3198, 3380, 3444, 3471, 3549, 3550, 3560, 3640, 3649, 3692, 3731, 3738, 3900, 3976, 4056, 4100, 4200, 4225, 4260, 4264, 4305, 4450, 4550, 4615, 4628, 4732, 4920, 4970, 4984, 5070, 5325, 5330, 5340, 5460, 5538, 5740, 5785, 5822, 5915, 5964, 6150, 6230, 6319, 6396, 6461, 6675, 6760, 6825, 6888, 6929, 6942, 7098, 7100, 7175, 7298, 7384, 7455, 7462, 7476, 7800, 7995, 8099, 8200, 8450, 8520, 8610, 8733, 8900, 9100, 9230, 9256, 9345, 9464, 9940, 10140, 10650, 10660, 10680, 10920, 10947, 11076, 11193, 11480, 11570, 11644, 11830, 11928, 11999, 12300, 12425, 12460, 12638, 12675, 12792, 12922, 13325, 13350, 13650, 13845, 13858, 13884, 14196, 14200, 14350, 14555, 14596, 14910, 14924, 14952, 15041, 15575, 15990, 16198, 16900, 17220, 17355, 17466, 17745, 17800, 18200, 18245, 18460, 18655, 18690, 18957, 19383, 19880, 20280, 20377, 20787, 21300, 21320, 21525, 21894, 22152, 22386, 23075, 23140, 23288, 23660, 23998, 24297, 24600, 24850, 24920, 25276, 25350, 25543, 25844, 26650, 26700, 27300, 27690, 27716, 27768, 28392, 28700, 28925, 29110, 29192, 29575, 29820, 29848, 30082, 31150, 31595, 31980, 32305, 32396, 33800, 34440, 34645, 34710, 34932, 35490, 35997, 36490, 36920, 37275, 37310, 37380, 37843, 37914, 38766, 39975, 40495, 40754, 41574, 42600, 43050, 43665, 43788, 44233, 44772, 45123, 46150, 46280, 46725, 47320, 47437, 47996, 48503, 48594, 49700, 50552, 50700, 51086, 51688, 53300, 53400, 54600, 54735, 55380, 55432, 55965, 57400, 57850, 58220, 59150, 59640, 59995, 60164, 61131, 62300, 63190, 63960, 64610, 64792, 69225, 69290, 69420, 69864, 70980, 71994, 72775, 72980, 74550, 74620, 74760, 75205, 75686, 75828, 76629, 77532, 79950, 80990, 81508, 82147, 83148, 83993, 86100, 86775, 87330, 87576, 88466, 88725, 89544, 90246, 91225, 92300, 93275, 93450, 94785, 94874, 95992, 96915, 97006, 97188, 99400, 101400, 101885, 102172, 103935, 105287, 106600, 109470, 110760, 111930, 113529, 115700, 116440, 118300, 119990, 120328, 121485, 122262, 124600, 126380, 127715, 129220, 132699, 138450, 138580, 138840, 141960, 142311, 143988, 145509, 145550, 145960, 149100, 149240, 150410, 151372, 151656, 153258, 155064, 157975, 159900, 161525, 161980, 163016, 164294, 166296, 167986, 172200, 173225, 173550, 174660, 176932, 177450, 179985, 180492, 182450, 184600, 186550, 186900, 189215, 189570, 189748, 193830, 194012, 194376, 202475, 203770, 204344, 207870, 210574, 218325, 218940, 221165, 223860, 225615, 227058, 231400, 236600, 237185, 239980, 242515, 242970, 244524, 246441, 251979, 252760, 255430, 258440, 259079, 264901, 265398, 273675, 276900, 277160, 279825, 284622, 287976, 291018, 291100, 298200, 299975, 300820, 302744, 305655, 306516, 315861, 315950, 319800, 323050, 323960, 328588, 332059, 335972, 346450, 347100, 349320, 353864, 354900, 359970, 360984, 364900, 373100, 373800, 376025, 378430, 379140, 379496, 383145, 387660, 388024, 404950, 407540, 410735, 415740, 419965, 421148, 436650, 437880, 442330, 447720, 451230, 454116, 473925, 474370, 479960, 484575, 485030, 485940, 489048, 491959, 492882, 503958, 509425, 510860, 518158, 519675, 526435, 529802, 530796, 547350, 553800, 559650, 567645, 569244, 575029, 582036, 582200, 599950, 601640, 607425, 611310, 613032, 616681, 631722, 631900, 638575, 646100, 657176, 663495, 664118, 671944, 692900, 694200, 709800, 711555, 719940, 727545, 729800, 746200, 752050, 756860, 758280, 766290, 775320, 777237, 794703, 809900, 815080, 821470, 831480, 839930, 842296, 873300, 884660, 899925, 902460, 908232, 946075, 947850, 948740, 969150, 970060, 971880, 983918, 985764, 996177, 1007916, 1018850, 1021720, 1036316, 1039350, 1052870, 1059604, 1061592, 1067911, 1094700, 1105825, 1119300, 1128075, 1135290, 1138488, 1150058, 1164072, 1185925, 1199900, 1212575, 1214850, 1222620, 1232205, 1233362, 1259895, 1263444, 1263800, 1277150, 1292200, 1295395, 1324505, 1326990, 1328236, 1385800, 1423110, 1439880, 1455090, 1475877, 1504100, 1513720, 1528275, 1532580, 1554474, 1579305, 1589406, 1619800, 1642940, 1660295, 1679860, 1725087, 1746600, 1769320, 1799850, 1804920, 1813553, 1850043, 1892150, 1895700, 1897480, 1915725, 1938300, 1940120, 1967836, 1971528, 1992354, 2015832, 2037700, 2053675, 2072632, 2078700, 2099825, 2105740, 2119208, 2135822, 2189400, 2211650, 2238600, 2256150, 2270580, 2300116, 2371850, 2399800, 2425150, 2429700, 2445240, 2459795, 2464410, 2466724, 2519790, 2526888, 2554300, 2590790, 2632175, 2649010, 2653980, 2656472, 2838225, 2846220, 2875145, 2910180, 2951754, 3008200, 3056550, 3065160, 3083405, 3108948, 3158610, 3178812, 3203733, 3285880, 3317475, 3320590, 3359720, 3368027, 3443713, 3450174, 3557775, 3599700, 3627106, 3637725, 3700086, 3784300, 3791400, 3831450, 3876600, 3886185, 3935672, 3973515, 3984708, 4075400, 4107350, 4157400, 4199650, 4211480, 4271644, 4316767, 4423300, 4512300, 4541160, 4600232, 4743700, 4850300, 4859400, 4919590, 4928820, 4933448, 4980885, 5039580, 5108600, 5181580, 5264350, 5298020, 5307960, 5339555, 5440659, 5676450, 5692440, 5750290, 5820360, 5903508, 6113100, 6161025, 6166810, 6217896, 6299475, 6317220, 6357624, 6407466, 6476975, 6622525, 6634950, 6641180, 6736054, 6887426, 6900348, 7115550, 7199400, 7254212, 7275450, 7379385, 7400172, 7475377, 7568600, 7662900, 7772370, 7896525, 7947030, 7969416, 8214700, 8301475, 8399300, 8543288, 8625435, 8633534, 8846600, 9024600, 9067765, 9250215, 9487400, 9700600, 9839180, 9857640, 9961770, 10079160, 10104081, 10331139, 10363160, 10528700, 10596040, 10679110, 10881318, 11352900, 11500580, 11807016, 12226200, 12298975, 12322050, 12333620, 12598950, 12634440, 12814932, 12950301, 12953950, 13245050, 13269900, 13282360, 13472108, 13774852, 13800696, 14231100, 14375725, 14508424, 14550900, 14758770, 14800344, 14950754, 15325800, 15417025, 15544740, 15793050, 15894060, 16018665, 16429400, 16602950, 16798600, 16840135, 17218565, 17250870, 17267068, 18135530, 18500430, 19430925, 19678360, 19867575, 19923540, 20208162, 20662278, 21057400, 21358220, 21583835, 21762636, 22426131, 22705800, 23001160, 23576189, 24597950, 24644100, 24667240, 24904425, 25197900, 25629864, 25900602, 25907900, 26490100, 26539800, 26697775, 26944216, 27203295, 27549704, 28462200, 28751450, 29101800, 29517540, 29901508, 30834050, 31089480, 31586100, 31788120, 32037330, 33205900, 33680270, 34437130, 34501740, 34534136, 36271060, 36896925, 37000860, 37376885, 38861850, 39735150, 39847080, 40416324, 41324556, 42716440, 43127175, 43167670, 43525272, 43784351, 44852262, 45338825, 46251075, 47152378, 49195900, 49288200, 49808850, 50395800, 50520405, 51655695, 51801204, 51815800, 52980200, 53395550, 54406590, 57502900, 59035080, 59803016, 61668100, 63172200, 64074660, 64751505, 66411800, 67360540, 68874260, 69003480, 70728567, 72542120, 73793850, 74001720, 74753770, 77723700, 79470300, 80093325, 80832648, 82649112, 84200675, 86092825, 86254350, 86335340, 87568702, 89704524, 90677650, 92502150, 94304756, 98391800, 99617700, 101040810, 103311390, 103602408, 106791100, 107919175, 108813180, 112130655, 115005800, 117880945, 123336200, 128149320, 129503010, 131353053, 134721080, 136016475, 137748520, 141457134, 147587700, 149507540, 155447400, 158940600, 160186650, 168401350, 172185650, 172508700, 172670680, 175137404, 179409048, 181355300, 185004300, 186884425, 188609512, 199235400, 202081620, 206622780, 213582200, 215838350, 217626360, 218921755, 224261310, 235761890, 252602025, 258278475, 259006020, 262706106, 272032950, 282914268, 295175400, 299015080, 306490457, 320373300, 323757525, 336802700, 344371300, 345017400, 350274808, 353642835, 362710600, 370008600, 373768850, 404163240, 413245560, 431676700, 437843510, 448522620, 471523780, 505204050, 516556950, 518012040, 525412212, 544065900, 560653275, 565828536, 589404725, 612980914, 640746600, 647515050, 656765265, 673605400, 688742600, 707285670, 747537700, 863353400, 875687020, 897045240, 919471371, 943047560, 1010408100, 1033113900, 1050824424, 1088131800, 1094608775, 1121306550, 1178809450, 1225961828, 1295030100, 1313530530, 1414571340, 1495075400, 1532452285, 1751374040, 1768214175, 1838942742, 2020816200, 2066227800, 2189217550, 2242613100, 2357618900, 2451923656, 2590060200, 2627061060, 2829142680, 3064904570, 3283826325, 3536428350, 3677885484, 4378435100, 4485226200, 4597356855, 4715237800, 5254122120, 6129809140, 6567652650, 7072856700, 7355770968, 7662261425, 8756870200, 9194713710, 12259618280, 13135305300, 14145713400, 15324522850, 18389427420, 22986784275, 26270610600, 30649045700, 36778854840, 45973568550, 61298091400, 91947137100, 183894274200]
約数ペア:
[(1, 183894274200), (2, 91947137100), (3, 61298091400), (4, 45973568550), (5, 36778854840), (6, 30649045700), (7, 26270610600), (8, 22986784275), (10, 18389427420), (12, 15324522850), (13, 14145713400), (14, 13135305300), (15, 12259618280), (20, 9194713710), (21, 8756870200), (24, 7662261425), (25, 7355770968), (26, 7072856700), (28, 6567652650), (30, 6129809140), (35, 5254122120), (39, 4715237800), (40, 4597356855), (41, 4485226200), (42, 4378435100), (50, 3677885484), (52, 3536428350), (56, 3283826325), (60, 3064904570), (65, 2829142680), (70, 2627061060), (71, 2590060200), (75, 2451923656), (78, 2357618900), (82, 2242613100), (84, 2189217550), (89, 2066227800), (91, 2020816200), (100, 1838942742), (104, 1768214175), (105, 1751374040), (120, 1532452285), (123, 1495075400), (130, 1414571340), (140, 1313530530), (142, 1295030100), (150, 1225961828), (156, 1178809450), (164, 1121306550), (168, 1094608775), (169, 1088131800), (175, 1050824424), (178, 1033113900), (182, 1010408100), (195, 943047560), (200, 919471371), (205, 897045240), (210, 875687020), (213, 863353400), (246, 747537700), (260, 707285670), (267, 688742600), (273, 673605400), (280, 656765265), (284, 647515050), (287, 640746600), (300, 612980914), (312, 589404725), (325, 565828536), (328, 560653275), (338, 544065900), (350, 525412212), (355, 518012040), (356, 516556950), (364, 505204050), (390, 471523780), (410, 448522620), (420, 437843510), (426, 431676700), (445, 413245560), (455, 404163240), (492, 373768850), (497, 370008600), (507, 362710600), (520, 353642835), (525, 350274808), (533, 345017400), (534, 344371300), (546, 336802700), (568, 323757525), (574, 320373300), (600, 306490457), (615, 299015080), (623, 295175400), (650, 282914268), (676, 272032950), (700, 262706106), (710, 259006020), (712, 258278475), (728, 252602025), (780, 235761890), (820, 224261310), (840, 218921755), (845, 217626360), (852, 215838350), (861, 213582200), (890, 206622780), (910, 202081620), (923, 199235400), (975, 188609512), (984, 186884425), (994, 185004300), (1014, 181355300), (1025, 179409048), (1050, 175137404), (1065, 172670680), (1066, 172508700), (1068, 172185650), (1092, 168401350), (1148, 160186650), (1157, 158940600), (1183, 155447400), (1230, 149507540), (1246, 147587700), (1300, 141457134), (1335, 137748520), (1352, 136016475), (1365, 134721080), (1400, 131353053), (1420, 129503010), (1435, 128149320), (1491, 123336200), (1560, 117880945), (1599, 115005800), (1640, 112130655), (1690, 108813180), (1704, 107919175), (1722, 106791100), (1775, 103602408), (1780, 103311390), (1820, 101040810), (1846, 99617700), (1869, 98391800), (1950, 94304756), (1988, 92502150), (2028, 90677650), (2050, 89704524), (2100, 87568702), (2130, 86335340), (2132, 86254350), (2136, 86092825), (2184, 84200675), (2225, 82649112), (2275, 80832648), (2296, 80093325), (2314, 79470300), (2366, 77723700), (2460, 74753770), (2485, 74001720), (2492, 73793850), (2535, 72542120), (2600, 70728567), (2665, 69003480), (2670, 68874260), (2730, 67360540), (2769, 66411800), (2840, 64751505), (2870, 64074660), (2911, 63172200), (2982, 61668100), (3075, 59803016), (3115, 59035080), (3198, 57502900), (3380, 54406590), (3444, 53395550), (3471, 52980200), (3549, 51815800), (3550, 51801204), (3560, 51655695), (3640, 50520405), (3649, 50395800), (3692, 49808850), (3731, 49288200), (3738, 49195900), (3900, 47152378), (3976, 46251075), (4056, 45338825), (4100, 44852262), (4200, 43784351), (4225, 43525272), (4260, 43167670), (4264, 43127175), (4305, 42716440), (4450, 41324556), (4550, 40416324), (4615, 39847080), (4628, 39735150), (4732, 38861850), (4920, 37376885), (4970, 37000860), (4984, 36896925), (5070, 36271060), (5325, 34534136), (5330, 34501740), (5340, 34437130), (5460, 33680270), (5538, 33205900), (5740, 32037330), (5785, 31788120), (5822, 31586100), (5915, 31089480), (5964, 30834050), (6150, 29901508), (6230, 29517540), (6319, 29101800), (6396, 28751450), (6461, 28462200), (6675, 27549704), (6760, 27203295), (6825, 26944216), (6888, 26697775), (6929, 26539800), (6942, 26490100), (7098, 25907900), (7100, 25900602), (7175, 25629864), (7298, 25197900), (7384, 24904425), (7455, 24667240), (7462, 24644100), (7476, 24597950), (7800, 23576189), (7995, 23001160), (8099, 22705800), (8200, 22426131), (8450, 21762636), (8520, 21583835), (8610, 21358220), (8733, 21057400), (8900, 20662278), (9100, 20208162), (9230, 19923540), (9256, 19867575), (9345, 19678360), (9464, 19430925), (9940, 18500430), (10140, 18135530), (10650, 17267068), (10660, 17250870), (10680, 17218565), (10920, 16840135), (10947, 16798600), (11076, 16602950), (11193, 16429400), (11480, 16018665), (11570, 15894060), (11644, 15793050), (11830, 15544740), (11928, 15417025), (11999, 15325800), (12300, 14950754), (12425, 14800344), (12460, 14758770), (12638, 14550900), (12675, 14508424), (12792, 14375725), (12922, 14231100), (13325, 13800696), (13350, 13774852), (13650, 13472108), (13845, 13282360), (13858, 13269900), (13884, 13245050), (14196, 12953950), (14200, 12950301), (14350, 12814932), (14555, 12634440), (14596, 12598950), (14910, 12333620), (14924, 12322050), (14952, 12298975), (15041, 12226200), (15575, 11807016), (15990, 11500580), (16198, 11352900), (16900, 10881318), (17220, 10679110), (17355, 10596040), (17466, 10528700), (17745, 10363160), (17800, 10331139), (18200, 10104081), (18245, 10079160), (18460, 9961770), (18655, 9857640), (18690, 9839180), (18957, 9700600), (19383, 9487400), (19880, 9250215), (20280, 9067765), (20377, 9024600), (20787, 8846600), (21300, 8633534), (21320, 8625435), (21525, 8543288), (21894, 8399300), (22152, 8301475), (22386, 8214700), (23075, 7969416), (23140, 7947030), (23288, 7896525), (23660, 7772370), (23998, 7662900), (24297, 7568600), (24600, 7475377), (24850, 7400172), (24920, 7379385), (25276, 7275450), (25350, 7254212), (25543, 7199400), (25844, 7115550), (26650, 6900348), (26700, 6887426), (27300, 6736054), (27690, 6641180), (27716, 6634950), (27768, 6622525), (28392, 6476975), (28700, 6407466), (28925, 6357624), (29110, 6317220), (29192, 6299475), (29575, 6217896), (29820, 6166810), (29848, 6161025), (30082, 6113100), (31150, 5903508), (31595, 5820360), (31980, 5750290), (32305, 5692440), (32396, 5676450), (33800, 5440659), (34440, 5339555), (34645, 5307960), (34710, 5298020), (34932, 5264350), (35490, 5181580), (35997, 5108600), (36490, 5039580), (36920, 4980885), (37275, 4933448), (37310, 4928820), (37380, 4919590), (37843, 4859400), (37914, 4850300), (38766, 4743700), (39975, 4600232), (40495, 4541160), (40754, 4512300), (41574, 4423300), (42600, 4316767), (43050, 4271644), (43665, 4211480), (43788, 4199650), (44233, 4157400), (44772, 4107350), (45123, 4075400), (46150, 3984708), (46280, 3973515), (46725, 3935672), (47320, 3886185), (47437, 3876600), (47996, 3831450), (48503, 3791400), (48594, 3784300), (49700, 3700086), (50552, 3637725), (50700, 3627106), (51086, 3599700), (51688, 3557775), (53300, 3450174), (53400, 3443713), (54600, 3368027), (54735, 3359720), (55380, 3320590), (55432, 3317475), (55965, 3285880), (57400, 3203733), (57850, 3178812), (58220, 3158610), (59150, 3108948), (59640, 3083405), (59995, 3065160), (60164, 3056550), (61131, 3008200), (62300, 2951754), (63190, 2910180), (63960, 2875145), (64610, 2846220), (64792, 2838225), (69225, 2656472), (69290, 2653980), (69420, 2649010), (69864, 2632175), (70980, 2590790), (71994, 2554300), (72775, 2526888), (72980, 2519790), (74550, 2466724), (74620, 2464410), (74760, 2459795), (75205, 2445240), (75686, 2429700), (75828, 2425150), (76629, 2399800), (77532, 2371850), (79950, 2300116), (80990, 2270580), (81508, 2256150), (82147, 2238600), (83148, 2211650), (83993, 2189400), (86100, 2135822), (86775, 2119208), (87330, 2105740), (87576, 2099825), (88466, 2078700), (88725, 2072632), (89544, 2053675), (90246, 2037700), (91225, 2015832), (92300, 1992354), (93275, 1971528), (93450, 1967836), (94785, 1940120), (94874, 1938300), (95992, 1915725), (96915, 1897480), (97006, 1895700), (97188, 1892150), (99400, 1850043), (101400, 1813553), (101885, 1804920), (102172, 1799850), (103935, 1769320), (105287, 1746600), (106600, 1725087), (109470, 1679860), (110760, 1660295), (111930, 1642940), (113529, 1619800), (115700, 1589406), (116440, 1579305), (118300, 1554474), (119990, 1532580), (120328, 1528275), (121485, 1513720), (122262, 1504100), (124600, 1475877), (126380, 1455090), (127715, 1439880), (129220, 1423110), (132699, 1385800), (138450, 1328236), (138580, 1326990), (138840, 1324505), (141960, 1295395), (142311, 1292200), (143988, 1277150), (145509, 1263800), (145550, 1263444), (145960, 1259895), (149100, 1233362), (149240, 1232205), (150410, 1222620), (151372, 1214850), (151656, 1212575), (153258, 1199900), (155064, 1185925), (157975, 1164072), (159900, 1150058), (161525, 1138488), (161980, 1135290), (163016, 1128075), (164294, 1119300), (166296, 1105825), (167986, 1094700), (172200, 1067911), (173225, 1061592), (173550, 1059604), (174660, 1052870), (176932, 1039350), (177450, 1036316), (179985, 1021720), (180492, 1018850), (182450, 1007916), (184600, 996177), (186550, 985764), (186900, 983918), (189215, 971880), (189570, 970060), (189748, 969150), (193830, 948740), (194012, 947850), (194376, 946075), (202475, 908232), (203770, 902460), (204344, 899925), (207870, 884660), (210574, 873300), (218325, 842296), (218940, 839930), (221165, 831480), (223860, 821470), (225615, 815080), (227058, 809900), (231400, 794703), (236600, 777237), (237185, 775320), (239980, 766290), (242515, 758280), (242970, 756860), (244524, 752050), (246441, 746200), (251979, 729800), (252760, 727545), (255430, 719940), (258440, 711555), (259079, 709800), (264901, 694200), (265398, 692900), (273675, 671944), (276900, 664118), (277160, 663495), (279825, 657176), (284622, 646100), (287976, 638575), (291018, 631900), (291100, 631722), (298200, 616681), (299975, 613032), (300820, 611310), (302744, 607425), (305655, 601640), (306516, 599950), (315861, 582200), (315950, 582036), (319800, 575029), (323050, 569244), (323960, 567645), (328588, 559650), (332059, 553800), (335972, 547350), (346450, 530796), (347100, 529802), (349320, 526435), (353864, 519675), (354900, 518158), (359970, 510860), (360984, 509425), (364900, 503958), (373100, 492882), (373800, 491959), (376025, 489048), (378430, 485940), (379140, 485030), (379496, 484575), (383145, 479960), (387660, 474370), (388024, 473925), (404950, 454116), (407540, 451230), (410735, 447720), (415740, 442330), (419965, 437880), (421148, 436650)]このpageの処理時間: 1.5369160175323486 seconds