Q: What is the sum of all factors of the number 3,591 excluding 3,591?
A: 2,809
The factors of the number 3,591 are: 1, 3, 7, 9, 19, 21, 27, 57, 63, 133, 171, 189, 399, 513, 1197, 3591.
If you add them up, you will get the total of 3,593. Now subtract 3,591 to get 2,809