81572908 has 12 divisors (see below), whose sum is σ = 142865632. Its totient is φ = 40754160.

The previous prime is 81572893. The next prime is 81572917. The reversal of 81572908 is 80927518.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 1860 + ... + 12907.

Almost surely, 2^81572908 is an apocalyptic number.

It is an amenable number.

81572908 is a deficient number, since it is larger than the sum of its proper divisors (61292724).

81572908 is a wasteful number, since it uses less digits than its factorization.

81572908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16152 (or 16150 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 81572908 is about 9031.7721406156. The cubic root of 81572908 is about 433.6925696954.

The spelling of 81572908 in words is "eighty-one million, five hundred seventy-two thousand, nine hundred eight".