About the Number

128806990

128806989 ← → 128806991

2進数表記:111101011010111000001001110

漢数字表記:一億二千八百八十万六千九百九十

素因数分解:

2 1 × 5 1 × 13 1 × 37 1 × 61 1 × 439 1

素因数の和:557
約数の個数: 64
約数和(自身を含む): 261233280
約数和(自身を除く): 132426290

約数列:
[1, 2, 5, 10, 13, 26, 37, 61, 65, 74, 122, 130, 185, 305, 370, 439, 481, 610, 793, 878, 962, 1586, 2195, 2257, 2405, 3965, 4390, 4514, 4810, 5707, 7930, 11285, 11414, 16243, 22570, 26779, 28535, 29341, 32486, 53558, 57070, 58682, 81215, 133895, 146705, 162430, 211159, 267790, 293410, 348127, 422318, 696254, 990823, 1055795, 1740635, 1981646, 2111590, 3481270, 4954115, 9908230, 12880699, 25761398, 64403495, 128806990]

約数ペア:
[(1, 128806990), (2, 64403495), (5, 25761398), (10, 12880699), (13, 9908230), (26, 4954115), (37, 3481270), (61, 2111590), (65, 1981646), (74, 1740635), (122, 1055795), (130, 990823), (185, 696254), (305, 422318), (370, 348127), (439, 293410), (481, 267790), (610, 211159), (793, 162430), (878, 146705), (962, 133895), (1586, 81215), (2195, 58682), (2257, 57070), (2405, 53558), (3965, 32486), (4390, 29341), (4514, 28535), (4810, 26779), (5707, 22570), (7930, 16243), (11285, 11414)]

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