81032872 has 16 divisors (see below), whose sum is σ = 159933600. Its totient is φ = 38383920.

The previous prime is 81032867. The next prime is 81032893. The reversal of 81032872 is 27823018.

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, 266404 + ... + 266707.

It is an arithmetic number, because the mean of its divisors is an integer number (9995850).

Almost surely, 2^81032872 is an apocalyptic number.

It is an amenable number.

81032872 is a deficient number, since it is larger than the sum of its proper divisors (78900728).

81032872 is a wasteful number, since it uses less digits than its factorization.

81032872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533136 (or 533132 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81032872 is about 9001.8260369772. The cubic root of 81032872 is about 432.7333935810.

The spelling of 81032872 in words is "eighty-one million, thirty-two thousand, eight hundred seventy-two".