Q: What is the sum of all factors of the number 639,916 excluding 639,916?

 A: 479,944

Why is 479,944 the sum of all factors of 639,916, excluding 639,916?

The factors of the number 639,916 are: 1, 2, 4, 159979, 319958, 639916.

If you add them up, you will get the total of 640,395. Now subtract 639,916 to get 479,944


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