78640000

素因数分解:

$2^7\times 5^4\times {\mathrm{983}}^1$

素因数の和:1017

約数の個数: 80

約数和(自身を含む): 195968520

約数和(自身を除く): 117328520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 500, 625, 640, 800, 983, 1000, 1250, 1600, 1966, 2000, 2500, 3200, 3932, 4000, 4915, 5000, 7864, 8000, 9830, 10000, 15728, 16000, 19660, 20000, 24575, 31456, 39320, 40000, 49150, 62912, 78640, 80000, 98300, 122875, 125824, 157280, 196600, 245750, 314560, 393200, 491500, 614375, 629120, 786400, 983000, 1228750, 1572800, 1966000, 2457500, 3145600, 3932000, 4915000, 7864000, 9830000, 15728000, 19660000, 39320000, 78640000]

約数ペア:

[(1, 78640000), (2, 39320000), (4, 19660000), (5, 15728000), (8, 9830000), (10, 7864000), (16, 4915000), (20, 3932000), (25, 3145600), (32, 2457500), (40, 1966000), (50, 1572800), (64, 1228750), (80, 983000), (100, 786400), (125, 629120), (128, 614375), (160, 491500), (200, 393200), (250, 314560), (320, 245750), (400, 196600), (500, 157280), (625, 125824), (640, 122875), (800, 98300), (983, 80000), (1000, 78640), (1250, 62912), (1600, 49150), (1966, 40000), (2000, 39320), (2500, 31456), (3200, 24575), (3932, 20000), (4000, 19660), (4915, 16000), (5000, 15728), (7864, 10000), (8000, 9830)]