Q: What is the sum of all factors of the number 6,405 excluding 6,405?
A: 5,499
The factors of the number 6,405 are: 1, 3, 5, 7, 15, 21, 35, 61, 105, 183, 305, 427, 915, 1281, 2135, 6405.
If you add them up, you will get the total of 6,410. Now subtract 6,405 to get 5,499