31940880 has 40 divisors (see below), whose sum is σ = 99017472. Its totient is φ = 8517504.

The previous prime is 31940837. The next prime is 31940899. The reversal of 31940880 is 8804913.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66304 + ... + 66783.

Almost surely, 2^31940880 is an apocalyptic number.

31940880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31940880 is an abundant number, since it is smaller than the sum of its proper divisors (67076592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31940880 is a wasteful number, since it uses less digits than its factorization.

31940880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133103 (or 133097 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 31940880 is about 5651.6263146107. The cubic root of 31940880 is about 317.2845749691.

The spelling of 31940880 in words is "thirty-one million, nine hundred forty thousand, eight hundred eighty".