28781991

素因数分解:

$3^2\times 7^1\times {\mathrm{79}}^1\times {\mathrm{5783}}^1$

素因数の和:5875

約数の個数: 24

約数和(自身を含む): 48122880

約数和(自身を除く): 19340889

約数列:

[1, 3, 7, 9, 21, 63, 79, 237, 553, 711, 1659, 4977, 5783, 17349, 40481, 52047, 121443, 364329, 456857, 1370571, 3197999, 4111713, 9593997, 28781991]

約数ペア:

[(1, 28781991), (3, 9593997), (7, 4111713), (9, 3197999), (21, 1370571), (63, 456857), (79, 364329), (237, 121443), (553, 52047), (711, 40481), (1659, 17349), (4977, 5783)]