72656918 has 4 divisors (see below), whose sum is σ = 108985380. Its totient is φ = 36328458.

The previous prime is 72656869. The next prime is 72656989. The reversal of 72656918 is 81965627.

It is a semiprime because it is the product of two primes.

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, 18164228 + ... + 18164231.

It is an arithmetic number, because the mean of its divisors is an integer number (27246345).

Almost surely, 2^72656918 is an apocalyptic number.

72656918 is a deficient number, since it is larger than the sum of its proper divisors (36328462).

72656918 is a wasteful number, since it uses less digits than its factorization.

72656918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36328461.

The product of its digits is 181440, while the sum is 44.

The square root of 72656918 is about 8523.9027446352. The cubic root of 72656918 is about 417.2781624737.

The spelling of 72656918 in words is "seventy-two million, six hundred fifty-six thousand, nine hundred eighteen".