1 + 2 + 3 + 4 + 5 + 6 + 8 + 10 + 12 + 15 + 16 + 20 + 24 + 25 + 30 + 32 + 40 + 48 + 50 + 60 + 75 + 80 + 96 + 100 + 120 + 125 + 150 + 160 + 200 + 240 + 250 + 300 + 375 + 400 + 480 + 500 + 600 + 750 + 800 + 1000 + 1200 + 1500 + 2000 + 2400 + 3000 + 4000 + 6000 + 12000 = 39,312
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12000
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.