“If everything was perfect, you would never learn and you would never grow.” -Beyoncé

As human beings, we may be far from perfect. Even our mathematical celebrations, like Pi Day, are mere approximations. But there are a few mathematical quantities out there that *really are* perfect. And today, June 28th, I’d like to share with you a celebration we should all be able to partake in: perfect number day!

Most numbers are deficient, in the sense that if you added up all their divisors (other than themselves), you get a number *less than* the original one you began with. A few of them — about 24.8% of the countable numbers — wind up being abundant, or with a number greater than the original one you began with.

But a select few of them — with only 48 known so far — are perfect. Go read the whole story of them here!