About the Number

81728790

81728789 ← → 81728791

2進数表記:100110111110001010100010110

漢数字表記:八千百七十二万八千七百九十

素因数分解:

2 1 × 3 1 × 5 1 × 11 1 × 13 1 × 19051 1

素因数の和:19085
約数の個数: 64
約数和(自身を含む): 230452992
約数和(自身を除く): 148724202

約数列:
[1, 2, 3, 5, 6, 10, 11, 13, 15, 22, 26, 30, 33, 39, 55, 65, 66, 78, 110, 130, 143, 165, 195, 286, 330, 390, 429, 715, 858, 1430, 2145, 4290, 19051, 38102, 57153, 95255, 114306, 190510, 209561, 247663, 285765, 419122, 495326, 571530, 628683, 742989, 1047805, 1238315, 1257366, 1485978, 2095610, 2476630, 2724293, 3143415, 3714945, 5448586, 6286830, 7429890, 8172879, 13621465, 16345758, 27242930, 40864395, 81728790]

約数ペア:
[(1, 81728790), (2, 40864395), (3, 27242930), (5, 16345758), (6, 13621465), (10, 8172879), (11, 7429890), (13, 6286830), (15, 5448586), (22, 3714945), (26, 3143415), (30, 2724293), (33, 2476630), (39, 2095610), (55, 1485978), (65, 1257366), (66, 1238315), (78, 1047805), (110, 742989), (130, 628683), (143, 571530), (165, 495326), (195, 419122), (286, 285765), (330, 247663), (390, 209561), (429, 190510), (715, 114306), (858, 95255), (1430, 57153), (2145, 38102), (4290, 19051)]

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