The factors of the number 721,646,604 are: 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 27, 28, 36, 42, 54, 63, 84, 108, 126, 189, 252, 283, 378, 566, 756, 849, 1132, 1698, 1981, 2547, 3373, 3396, 3962, 5094, 5943, 6746, 7641, 7924, 10119, 10188, 11886, 13492, 15282, 17829, 20238, 23611, 23772, 30357, 30564, 35658, 40476, 47222, 53487, 60714, 70833, 71316, 91071, 94444, 106974, 121428, 141666, 182142, 212499, 213948, 283332, 364284, 424998, 637497, 849996, 954559, 1274994, 1909118, 2549988, 2863677, 3818236, 5727354, 6681913, 8591031, 11454708, 13363826, 17182062, 20045739, 25773093, 26727652, 34364124, 40091478, 51546186, 60137217, 80182956, 103092372, 120274434, 180411651, 240548868, 360823302, 721646604.
If you add them up, you will get the total of 2,146,403,840.