Q: What is the sum of all factors of the number 721,216,730 excluding 721,216,730?

A: 678,837,814

Why is 678,837,814 the sum of all factors of 721,216,730, excluding 721,216,730?

The factors of the number 721,216,730 are: 1, 2, 5, 10, 13, 26, 65, 130, 773, 1546, 3865, 7177, 7730, 10049, 14354, 20098, 35885, 50245, 71770, 93301, 100490, 186602, 466505, 933010, 5547821, 11095642, 27739105, 55478210, 72121673, 144243346, 360608365, 721216730.

If you add them up, you will get the total of 721,217,408. Now subtract 721,216,730 to get 678,837,814