Q: What is the sum of all factors of the number 639,604 excluding 639,604?
A: 666,764
The factors of the number 639,604 are: 1, 2, 4, 7, 14, 28, 53, 106, 212, 371, 431, 742, 862, 1484, 1724, 3017, 6034, 12068, 22843, 45686, 91372, 159901, 319802, 639604.
If you add them up, you will get the total of 640,270. Now subtract 639,604 to get 666,764