Q: What is the sum of all factors of the number 1,215 excluding 1,215?

 A: 969

Why is 969 the sum of all factors of 1,215, excluding 1,215?

The factors of the number 1,215 are: 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215.

If you add them up, you will get the total of 2,184. Now subtract 1,215 to get 969


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