72656624 has 10 divisors (see below), whose sum is σ = 140772240. Its totient is φ = 36328304.

The previous prime is 72656611. The next prime is 72656651. The reversal of 72656624 is 42665627.

It is a super-2 number, since 2×72656624² = 10557970022154752, which contains 22 as substring.

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, 2270504 + ... + 2270535.

It is an arithmetic number, because the mean of its divisors is an integer number (14077224).

Almost surely, 2^72656624 is an apocalyptic number.

It is an amenable number.

72656624 is a deficient number, since it is larger than the sum of its proper divisors (68115616).

72656624 is a wasteful number, since it uses less digits than its factorization.

72656624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541047 (or 4541041 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 72656624 is about 8523.8854989963. The cubic root of 72656624 is about 417.2775996461.

The spelling of 72656624 in words is "seventy-two million, six hundred fifty-six thousand, six hundred twenty-four".