72857872 has 20 divisors (see below), whose sum is σ = 141333340. Its totient is φ = 36384768.

The previous prime is 72857791. The next prime is 72857893. The reversal of 72857872 is 27875827.

It can be written as a sum of positive squares in 2 ways, for example, as 6533136 + 66324736 = 2556^2 + 8144^2 .

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, 13888 + ... + 18400.

It is an arithmetic number, because the mean of its divisors is an integer number (7066667).

Almost surely, 2^72857872 is an apocalyptic number.

It is an amenable number.

72857872 is a deficient number, since it is larger than the sum of its proper divisors (68475468).

72857872 is a wasteful number, since it uses less digits than its factorization.

72857872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530 (or 5524 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The square root of 72857872 is about 8535.6822808725. The cubic root of 72857872 is about 417.6625100320.

The spelling of 72857872 in words is "seventy-two million, eight hundred fifty-seven thousand, eight hundred seventy-two".