A perfect number is a number that is the sum of all its proper factors (that is all its factors excluding itself).
The next perfect number after 28 is 496
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The next perfect number after 11 is 28.
28 is a perfect number.
22 is not a perfect number but 6, 28, 496 and 8128 are perfect numbers.
29 is not a perfect number - though 28, its predecessor, is.
No, it is not a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.