Q: What is the sum of all factors of the number 9,975 excluding 9,975?

A: 9,865

Why is 9,865 the sum of all factors of 9,975, excluding 9,975?

The factors of the number 9,975 are: 1, 3, 5, 7, 15, 19, 21, 25, 35, 57, 75, 95, 105, 133, 175, 285, 399, 475, 525, 665, 1425, 1995, 3325, 9975.

If you add them up, you will get the total of 9,984. Now subtract 9,975 to get 9,865

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