Q: What is the sum of all factors of the number 78 excluding 78?

 A: 90

Why is 90 the sum of all factors of 78, excluding 78?

The factors of the number 78 are: 1, 2, 3, 6, 13, 26, 39, 78.

If you add them up, you will get the total of 168. Now subtract 78 to get 90


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