81733972 has 24 divisors (see below), whose sum is σ = 150883040. Its totient is φ = 38633760.

The previous prime is 81733969. The next prime is 81734017. The reversal of 81733972 is 27933718.

It is a congruent number.

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, 49423 + ... + 51049.

Almost surely, 2^81733972 is an apocalyptic number.

It is an amenable number.

81733972 is a deficient number, since it is larger than the sum of its proper divisors (69149068).

81733972 is a wasteful number, since it uses less digits than its factorization.

81733972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311 (or 2309 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 81733972 is about 9040.6842661383. The cubic root of 81733972 is about 433.9778210048.

The spelling of 81733972 in words is "eighty-one million, seven hundred thirty-three thousand, nine hundred seventy-two".