Q: What is the sum of all factors of the number 640,685 excluding 640,685?

 A: 136,651

Why is 136,651 the sum of all factors of 640,685, excluding 640,685?

The factors of the number 640,685 are: 1, 5, 97, 485, 1321, 6605, 128137, 640685.

If you add them up, you will get the total of 640,821. Now subtract 640,685 to get 136,651


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