Q: What is the sum of all factors of the number 870 excluding 870?

 A: 1,290

Why is 1,290 the sum of all factors of 870, excluding 870?

The factors of the number 870 are: 1, 2, 3, 5, 6, 10, 15, 29, 30, 58, 87, 145, 174, 290, 435, 870.

If you add them up, you will get the total of 871. Now subtract 870 to get 1,290


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