Q: What is the sum of all factors of the number 66 excluding 66?

 A: 78

Why is 78 the sum of all factors of 66, excluding 66?

The factors of the number 66 are: 1, 2, 3, 6, 11, 22, 33, 66.

If you add them up, you will get the total of 144. Now subtract 66 to get 78


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