Q: What is the sum of all factors of the number 645,811 excluding 645,811?

 A: 1,989

Why is 1,989 the sum of all factors of 645,811, excluding 645,811?

The factors of the number 645,811 are: 1, 409, 1579, 645811.

If you add them up, you will get the total of 645,812. Now subtract 645,811 to get 1,989


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