There are quite many questions involving perfect numbers. Both even and odd perfect numbers are interesting in their own right, and then there are also numbers that are almost perfect, quasiperfect, multiply perfect, hemiperfect, hyperperfect, superperfect, unitary perfect, semiperfect etc. In addition, this tag already exists on MathOverflow. I think it would be useful to have this tag on MSE as well.
closed as unclear what you're asking by Najib Idrissi, yoknapatawpha, Yagna Patel, Shailesh, BLAZE Jan 28 '16 at 1:00
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