Perfect Numbers

A number which is equal to the sum of its divisors except itself:
1) 6 = 1+2+3
2) 28 = 1+2+4+7+14
3) 496
4) 8128
5) 33,550,336
6) 8,589,869,056
7) 7th number has 1373 digits and
8) It has not been found
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