72904912 has 10 divisors (see below), whose sum is σ = 141253298. Its totient is φ = 36452448.

The previous prime is 72904907. The next prime is 72904921. The reversal of 72904912 is 21940927.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 41616 = 8536^2 + 204^2 .

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, 2278263 + ... + 2278294.

Almost surely, 2^72904912 is an apocalyptic number.

It is an amenable number.

72904912 is a deficient number, since it is larger than the sum of its proper divisors (68348386).

72904912 is a wasteful number, since it uses less digits than its factorization.

72904912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556565 (or 4556559 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 72904912 is about 8538.4373277550. The cubic root of 72904912 is about 417.7523773183.

The spelling of 72904912 in words is "seventy-two million, nine hundred four thousand, nine hundred twelve".