Q: What is the sum of all factors of the number 643,643 excluding 643,643?
A: 221,893
The factors of the number 643,643 are: 1, 7, 11, 13, 77, 91, 143, 643, 1001, 4501, 7073, 8359, 49511, 58513, 91949, 643643.
If you add them up, you will get the total of 643,864. Now subtract 643,643 to get 221,893