Q: What is the sum of all factors of the number 640,807 excluding 640,807?

 A: 3,249

Why is 3,249 the sum of all factors of 640,807, excluding 640,807?

The factors of the number 640,807 are: 1, 211, 3037, 640807.

If you add them up, you will get the total of 640,810. Now subtract 640,807 to get 3,249


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