There are more deficient numbers.
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Just use the basic definition of "abundant" and "deficient". That is, calculate all the factors of 50 (excluding 50 itself), add them up, then compare whether the result is more or less than 50.
Well, honey, 36 is what we call an "abundant" number. It's not perfect like a fairy tale ending, but it sure ain't deficient either. It's got more divisors than your average number, making it a bit of an overachiever in the math world.
Every sixth number for 12 and more will be an abundant number
There is a one-to-one relationship between even perfect numbers and Mersenne primes. It is unknown whether there are any odd perfect numbers.
149162536496481100121144169196225256289324361400------------The above numbers are squares not perfect numbers. A perfect number n is one that is equal to the proper divisors of n. Here are the first few:628496812833550336858986905613743869132823058430081399521282658455991569831744654692615953842176191561942608236107294793378084303638130997321548169216I don't know if more of them are known. For more information see oeis.org.