72639916 has 12 divisors (see below), whose sum is σ = 127523088. Its totient is φ = 36204752.

The previous prime is 72639901. The next prime is 72639923. The reversal of 72639916 is 61993627.

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, 27376 + ... + 29911.

It is an arithmetic number, because the mean of its divisors is an integer number (10626924).

Almost surely, 2^72639916 is an apocalyptic number.

It is an amenable number.

72639916 is a deficient number, since it is larger than the sum of its proper divisors (54883172).

72639916 is a wasteful number, since it uses less digits than its factorization.

72639916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57608 (or 57606 counting only the distinct ones).

The product of its digits is 122472, while the sum is 43.

The square root of 72639916 is about 8522.9053731694. The cubic root of 72639916 is about 417.2456116996.

The spelling of 72639916 in words is "seventy-two million, six hundred thirty-nine thousand, nine hundred sixteen".