Q: What is the sum of all factors of the number 1,280 excluding 1,280?

 A: 1,786

Why is 1,786 the sum of all factors of 1,280, excluding 1,280?

The factors of the number 1,280 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280.

If you add them up, you will get the total of 1,281. Now subtract 1,280 to get 1,786


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