Q: What is the sum of all factors of the number 642,560 excluding 642,560?

A: 904,216

Why is 904,216 the sum of all factors of 642,560, excluding 642,560?

The factors of the number 642,560 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 251, 256, 320, 502, 512, 640, 1004, 1255, 1280, 2008, 2510, 2560, 4016, 5020, 8032, 10040, 16064, 20080, 32128, 40160, 64256, 80320, 128512, 160640, 321280, 642560.

If you add them up, you will get the total of 643,464. Now subtract 642,560 to get 904,216