Q: What is the sum of all factors of the number 1,278 excluding 1,278?

 A: 1,530

Why is 1,530 the sum of all factors of 1,278, excluding 1,278?

The factors of the number 1,278 are: 1, 2, 3, 6, 9, 18, 71, 142, 213, 426, 639, 1278.

If you add them up, you will get the total of 1,279. Now subtract 1,278 to get 1,530


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