Q: What is the sum of all factors of the number 638,560 excluding 638,560?

A: 991,376

Why is 991,376 the sum of all factors of 638,560, excluding 638,560?

The factors of the number 638,560 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 307, 416, 520, 614, 1040, 1228, 1535, 2080, 2456, 3070, 3991, 4912, 6140, 7982, 9824, 12280, 15964, 19955, 24560, 31928, 39910, 49120, 63856, 79820, 127712, 159640, 319280, 638560.

If you add them up, you will get the total of 639,551. Now subtract 638,560 to get 991,376