128878625

素因数分解:

$5^3\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{421}}^1$

素因数の和:546

約数の個数: 32

約数和(自身を含む): 168529920

約数和(自身を除く): 39651295

約数列:

[1, 5, 25, 31, 79, 125, 155, 395, 421, 775, 1975, 2105, 2449, 3875, 9875, 10525, 12245, 13051, 33259, 52625, 61225, 65255, 166295, 306125, 326275, 831475, 1031029, 1631375, 4157375, 5155145, 25775725, 128878625]

約数ペア:

[(1, 128878625), (5, 25775725), (25, 5155145), (31, 4157375), (79, 1631375), (125, 1031029), (155, 831475), (395, 326275), (421, 306125), (775, 166295), (1975, 65255), (2105, 61225), (2449, 52625), (3875, 33259), (9875, 13051), (10525, 12245)]