Q: What is the sum of all factors of the number 3,915 excluding 3,915?

 A: 3,285

Why is 3,285 the sum of all factors of 3,915, excluding 3,915?

The factors of the number 3,915 are: 1, 3, 5, 9, 15, 27, 29, 45, 87, 135, 145, 261, 435, 783, 1305, 3915.

If you add them up, you will get the total of 3,918. Now subtract 3,915 to get 3,285


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