72904564 has 6 divisors (see below), whose sum is σ = 127582994. Its totient is φ = 36452280.

The previous prime is 72904543. The next prime is 72904571. The reversal of 72904564 is 46540927.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 824464 = 8490^2 + 908^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113067 + ... + 9113074.

Almost surely, 2^72904564 is an apocalyptic number.

It is an amenable number.

72904564 is a deficient number, since it is larger than the sum of its proper divisors (54678430).

72904564 is a wasteful number, since it uses less digits than its factorization.

72904564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18226145 (or 18226143 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 72904564 is about 8538.4169492945. The cubic root of 72904564 is about 417.7517126257.

The spelling of 72904564 in words is "seventy-two million, nine hundred four thousand, five hundred sixty-four".