Q: What is the sum of all factors of the number 7,780 excluding 7,780?
A: 8,600
The factors of the number 7,780 are: 1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 3890, 7780.
If you add them up, you will get the total of 7,788. Now subtract 7,780 to get 8,600