Q: What is the sum of all factors of the number 638,840 excluding 638,840?
A: 798,640
The factors of the number 638,840 are: 1, 2, 4, 5, 8, 10, 20, 40, 15971, 31942, 63884, 79855, 127768, 159710, 319420, 638840.
If you add them up, you will get the total of 639,638. Now subtract 638,840 to get 798,640