Q: What is the sum of all factors of the number 639,979 excluding 639,979?

 A: 8,181

Why is 8,181 the sum of all factors of 639,979, excluding 639,979?

The factors of the number 639,979 are: 1, 79, 8101, 639979.

If you add them up, you will get the total of 639,987. Now subtract 639,979 to get 8,181


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