The first two are 6 and 28. You'd have to figure a long time to get to the next one, which is 496.
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28
6443 = 6482 = 64
The smallest perfect square is 121.
463 is a whole number. So there's no different whole numberthat's any closer to it than it already is.
So far, no odd perfect numbers have been found to exist. If and only if one does exist, it will be far larger than the number in the question. In fact, it has been proven concretely that if an odd perfect number exists, it is greater than 10^300, and it is conjectured that if such a number exists, it is greater than 10^500.