Q: What is the sum of all factors of the number 780 excluding 780?

 A: 1,572

Why is 1,572 the sum of all factors of 780, excluding 780?

The factors of the number 780 are: 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780.

If you add them up, you will get the total of 781. Now subtract 780 to get 1,572


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