Q: What is the sum of all factors of the number 1,225 excluding 1,225?

 A: 542

Why is 542 the sum of all factors of 1,225, excluding 1,225?

The factors of the number 1,225 are: 1, 5, 7, 25, 35, 49, 175, 245, 1225.

If you add them up, you will get the total of 1,767. Now subtract 1,225 to get 542


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