Q: What is the sum of all factors of the number 1,290 excluding 1,290?
A: 1,878
The factors of the number 1,290 are: 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645, 1290.
If you add them up, you will get the total of 1,291. Now subtract 1,290 to get 1,878