Q: What is the sum of all factors of the number 642,989 excluding 642,989?

 A: 1,651

Why is 1,651 the sum of all factors of 642,989, excluding 642,989?

The factors of the number 642,989 are: 1, 631, 1019, 642989.

If you add them up, you will get the total of 642,990. Now subtract 642,989 to get 1,651


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