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Wolfram Alpha allows to test whether a positive integer $n$ is abundant, deficient or perfect. However, I was not able to find a way to test whether $n$ is semiperfect (i.e., equal to the sum of all or some of its proper divisors).

How can I go about testing this property in Wolfram Alpha?

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    $\begingroup$ This may be a better fit for Mathematica.SE. I don't know enough about Mathematica and WA to be certain, though. (Edit: I just checked, and WA questions are explicitly off-topic there. Maybe stack overflow?) $\endgroup$ – Arthur Apr 27 '18 at 6:41

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