81590032 has 40 divisors (see below), whose sum is σ = 163261376. Its totient is φ = 39470976.

The previous prime is 81590029. The next prime is 81590051. The reversal of 81590032 is 23009518.

It is a super-2 number, since 2×81590032² = 13313866643522048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167293 + ... + 167779.

Almost surely, 2^81590032 is an apocalyptic number.

It is an amenable number.

81590032 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

81590032 is a wasteful number, since it uses less digits than its factorization.

81590032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 81590032 is about 9032.7200775846. The cubic root of 81590032 is about 433.7229148681.

The spelling of 81590032 in words is "eighty-one million, five hundred ninety thousand, thirty-two".