72721804 has 12 divisors (see below), whose sum is σ = 127326024. Its totient is φ = 36342944.

The previous prime is 72721799. The next prime is 72721813. The reversal of 72721804 is 40812727.

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, 9384 + ... + 15280.

It is an arithmetic number, because the mean of its divisors is an integer number (10610502).

Almost surely, 2^72721804 is an apocalyptic number.

It is an amenable number.

72721804 is a deficient number, since it is larger than the sum of its proper divisors (54604220).

72721804 is a wasteful number, since it uses less digits than its factorization.

72721804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984 (or 8982 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72721804 is about 8527.7080156394. The cubic root of 72721804 is about 417.4023417704.

The spelling of 72721804 in words is "seventy-two million, seven hundred twenty-one thousand, eight hundred four".