1 + 2 + 4 + 5 + 8 + 10 + 20 + 25 + 40 + 50 + 100 + 125 + 200 + 250 + 500 + 1000 = 2,340
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No. Sum of Prime Numbers 1 - 1000 is: 76127 The factors of 76127 are: 1 269 283 76127 The prime factors are: 269 x 283
154 is the sum of the proper factors of 256.
Add them up. The factors of 9 are 1, 3 and 9. The sum of the factors is 13.
The odd factors of 70 are: 1, 5, 7, and 35. The sum of these factors is 48.
The prime factors of 28 are 2 and 7. Their sum is 9.