31989616 has 20 divisors (see below), whose sum is σ = 65242600. Its totient is φ = 15152832.

The previous prime is 31989593. The next prime is 31989667. The reversal of 31989616 is 61698913.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52311 + ... + 52918.

It is an arithmetic number, because the mean of its divisors is an integer number (3262130).

Almost surely, 2^31989616 is an apocalyptic number.

It is an amenable number.

31989616 is an abundant number, since it is smaller than the sum of its proper divisors (33252984).

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

31989616 is a wasteful number, since it uses less digits than its factorization.

31989616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105256 (or 105250 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 31989616 is about 5655.9363504198. The cubic root of 31989616 is about 317.4458659024.

The spelling of 31989616 in words is "thirty-one million, nine hundred eighty-nine thousand, six hundred sixteen".