28
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The sum of the 1st perfect number and 2nd perfect number is. . . 34!
It is the perfect square of that number.
The second perfect number after 6 is 28. The sum of the factors of 28, excluding itself, is 1 + 2 + 4 + 7 + 14 = 28.
4 because 2x2=4 and 4 x 4 x 4=64
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.