Q: What is the sum of all factors of the number 643,960 excluding 643,960?
A: 891,800
The factors of the number 643,960 are: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 947, 1894, 3788, 4735, 7576, 9470, 16099, 18940, 32198, 37880, 64396, 80495, 128792, 160990, 321980, 643960.
If you add them up, you will get the total of 644,851. Now subtract 643,960 to get 891,800