Q: What is the sum of all factors of the number 3,870 excluding 3,870?
A: 6,426
The factors of the number 3,870 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 43, 45, 86, 90, 129, 215, 258, 387, 430, 645, 774, 1290, 1935, 3870.
If you add them up, you will get the total of 3,876. Now subtract 3,870 to get 6,426