Q: What is the sum of all factors of the number 643,760 excluding 643,760?

A: 970,720

Why is 970,720 the sum of all factors of 643,760, excluding 643,760?

The factors of the number 643,760 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 619, 1040, 1238, 2476, 3095, 4952, 6190, 8047, 9904, 12380, 16094, 24760, 32188, 40235, 49520, 64376, 80470, 128752, 160940, 321880, 643760.

If you add them up, you will get the total of 644,730. Now subtract 643,760 to get 970,720