Q: What is the sum of all factors of the number 390 excluding 390?

 A: 618

Why is 618 the sum of all factors of 390, excluding 390?

The factors of the number 390 are: 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390.

If you add them up, you will get the total of 1,008. Now subtract 390 to get 618


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