Q: What is the sum of all factors of the number 640,971 excluding 640,971?

 A: 291,909

Why is 291,909 the sum of all factors of 640,971, excluding 640,971?

The factors of the number 640,971 are: 1, 3, 9, 229, 311, 687, 933, 2061, 2799, 71219, 213657, 640971.

If you add them up, you will get the total of 641,262. Now subtract 640,971 to get 291,909


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