Q: What is the sum of all factors of the number 2,178 excluding 2,178?
A: 3,009
The factors of the number 2,178 are: 1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 121, 198, 242, 363, 726, 1089, 2178.
If you add them up, you will get the total of 2,181. Now subtract 2,178 to get 3,009