28408779

素因数分解:

$3^3\times 7^2\times {\mathrm{109}}^1\times {\mathrm{197}}^1$

素因数の和:329

約数の個数: 48

約数和(自身を含む): 49658400

約数和(自身を除く): 21249621

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 109, 147, 189, 197, 327, 441, 591, 763, 981, 1323, 1379, 1773, 2289, 2943, 4137, 5319, 5341, 6867, 9653, 12411, 16023, 20601, 21473, 28959, 37233, 48069, 64419, 86877, 144207, 150311, 193257, 260631, 450933, 579771, 1052177, 1352799, 3156531, 4058397, 9469593, 28408779]

約数ペア:

[(1, 28408779), (3, 9469593), (7, 4058397), (9, 3156531), (21, 1352799), (27, 1052177), (49, 579771), (63, 450933), (109, 260631), (147, 193257), (189, 150311), (197, 144207), (327, 86877), (441, 64419), (591, 48069), (763, 37233), (981, 28959), (1323, 21473), (1379, 20601), (1773, 16023), (2289, 12411), (2943, 9653), (4137, 6867), (5319, 5341)]