Q: What is the sum of all factors of the number 661,721,440 excluding 661,721,440?

 A: 916,812,608

Why is 916,812,608 the sum of all factors of 661,721,440, excluding 661,721,440?

The factors of the number 661,721,440 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 103, 160, 206, 412, 515, 824, 1030, 1648, 2060, 3296, 4120, 8240, 16480, 40153, 80306, 160612, 200765, 321224, 401530, 642448, 803060, 1284896, 1606120, 3212240, 4135759, 6424480, 8271518, 16543036, 20678795, 33086072, 41357590, 66172144, 82715180, 132344288, 165430360, 330860720, 661721440.

If you add them up, you will get the total of 661,722,356. Now subtract 661,721,440 to get 916,812,608


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