It is a plaindrome in base 13.
It is a congruent number.
31680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
231680 is an apocalyptic number.
31680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59436).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31680 is a wasteful number, since it uses less digits than its factorization.
31680 is an evil number, because the sum of its binary digits is even.
The square root of 31680 is about 177.9887636903. The cubic root of 31680 is about 31.6418395739.
The spelling of 31680 in words is "thirty-one thousand, six hundred eighty".