Q: What is the sum of all factors of the number 6,400 excluding 6,400?

 A: 9,441

Why is 9,441 the sum of all factors of 6,400, excluding 6,400?

The factors of the number 6,400 are: 1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 640, 800, 1280, 1600, 3200, 6400.

If you add them up, you will get the total of 6,409. Now subtract 6,400 to get 9,441


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