Q: What is the sum of all factors of the number 9,639 excluding 9,639?
A: 7,785
The factors of the number 9,639 are: 1, 3, 7, 9, 17, 21, 27, 51, 63, 81, 119, 153, 189, 357, 459, 567, 1071, 1377, 3213, 9639.
If you add them up, you will get the total of 9,646. Now subtract 9,639 to get 7,785