Q: What is the sum of all factors of the number 640,028,135 excluding 640,028,135?

 A: 128,005,633

Why is 128,005,633 the sum of all factors of 640,028,135, excluding 640,028,135?

The factors of the number 640,028,135 are: 1, 5, 128005627, 640028135.

If you add them up, you will get the total of 640,028,263. Now subtract 640,028,135 to get 128,005,633


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