Q: What is the sum of all factors of the number 6,399 excluding 6,399?
A: 3,281
The factors of the number 6,399 are: 1, 3, 9, 27, 79, 81, 237, 711, 2133, 6399.
If you add them up, you will get the total of 6,402. Now subtract 6,399 to get 3,281