Q: What is the sum of all factors of the number 643,640 excluding 643,640?
A: 804,640
The factors of the number 643,640 are: 1, 2, 4, 5, 8, 10, 20, 40, 16091, 32182, 64364, 80455, 128728, 160910, 321820, 643640.
If you add them up, you will get the total of 644,444. Now subtract 643,640 to get 804,640