Q: What is the sum of all factors of the number 64,640 excluding 64,640?
A: 91,420
The factors of the number 64,640 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 101, 128, 160, 202, 320, 404, 505, 640, 808, 1010, 1616, 2020, 3232, 4040, 6464, 8080, 12928, 16160, 32320, 64640.
If you add them up, you will get the total of 64,731. Now subtract 64,640 to get 91,420