Q: What is the sum of all factors of the number 640,665,423 excluding 640,665,423?

 A: 308,468,577

Why is 308,468,577 the sum of all factors of 640,665,423, excluding 640,665,423?

The factors of the number 640,665,423 are: 1, 3, 9, 27, 23728349, 71185047, 213555141, 640665423.

If you add them up, you will get the total of 640,665,731. Now subtract 640,665,423 to get 308,468,577


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