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

 A: 890

Why is 890 the sum of all factors of 640, excluding 640?

The factors of the number 640 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640.

If you add them up, you will get the total of 1,530. Now subtract 640 to get 890


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