Q: What is the sum of all factors of the number 1,275 excluding 1,275?

 A: 957

Why is 957 the sum of all factors of 1,275, excluding 1,275?

The factors of the number 1,275 are: 1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275.

If you add them up, you will get the total of 2,232. Now subtract 1,275 to get 957


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