Q: What is the sum of all factors of the number 64,840 excluding 64,840?
A: 81,140
The factors of the number 64,840 are: 1, 2, 4, 5, 8, 10, 20, 40, 1621, 3242, 6484, 8105, 12968, 16210, 32420, 64840.
If you add them up, you will get the total of 64,921. Now subtract 64,840 to get 81,140