81932992 has 28 divisors (see below), whose sum is σ = 169657776. Its totient is φ = 39184640.

The previous prime is 81932971. The next prime is 81933001. The reversal of 81932992 is 29923918.

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, 26359 + ... + 29302.

Almost surely, 2^81932992 is an apocalyptic number.

It is an amenable number.

81932992 is an abundant number, since it is smaller than the sum of its proper divisors (87724784).

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

81932992 is a wasteful number, since it uses less digits than its factorization.

81932992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55696 (or 55686 counting only the distinct ones).

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

The square root of 81932992 is about 9051.6844841168. The cubic root of 81932992 is about 434.3297768906.

The spelling of 81932992 in words is "eighty-one million, nine hundred thirty-two thousand, nine hundred ninety-two".