Q: What is the sum of all factors of the number 3,975 excluding 3,975?
A: 2,721
The factors of the number 3,975 are: 1, 3, 5, 15, 25, 53, 75, 159, 265, 795, 1325, 3975.
If you add them up, you will get the total of 3,977. Now subtract 3,975 to get 2,721