31989080 has 16 divisors (see below), whose sum is σ = 71975520. Its totient is φ = 12795616.

The previous prime is 31989079. The next prime is 31989091. The reversal of 31989080 is 8098913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399824 + ... + 399903.

It is an arithmetic number, because the mean of its divisors is an integer number (4498470).

Almost surely, 2^31989080 is an apocalyptic number.

It is an amenable number.

31989080 is an abundant number, since it is smaller than the sum of its proper divisors (39986440).

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

31989080 is a wasteful number, since it uses less digits than its factorization.

31989080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799738 (or 799734 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 31989080 is about 5655.8889663783. Note that the first 3 decimals coincide. The cubic root of 31989080 is about 317.4440929110. Note that the first 3 decimals are identical.

The spelling of 31989080 in words is "thirty-one million, nine hundred eighty-nine thousand, eighty".