1, 2, 4, 8, 16, 32, 64, 127, 254, 508, 1016, 2032, 4064, 8128
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abundant since sum of divisors is 16256
8,128 = 26 × 127
6, 28, 496, 8128
There is a formula to calculate even perfect numbers, 2p-1(2p - 1) where p is a prime number. When p = 7 then 26(27 - 1) = 64 x 127 = 8128 So 8128 is the 4th perfect number. (The other three occur when p = 2, 3 and 5)
6, 28, 496, 8128, 33550336