31989632 has 32 divisors (see below), whose sum is σ = 63984600. Its totient is φ = 15930880.

The previous prime is 31989593. The next prime is 31989667. The reversal of 31989632 is 23698913.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 31989632.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 62594 + ... + 63102.

Almost surely, 2^31989632 is an apocalyptic number.

31989632 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31989632 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

31989632 is an equidigital number, since it uses as much as digits as its factorization.

31989632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1002 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 31989632 is about 5655.9377648627. The cubic root of 31989632 is about 317.4459188272.

The spelling of 31989632 in words is "thirty-one million, nine hundred eighty-nine thousand, six hundred thirty-two".