72555556 has 12 divisors (see below), whose sum is σ = 127533168. Its totient is φ = 36117512.

The previous prime is 72555521. The next prime is 72555563. The reversal of 72555556 is 65555527.

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, 39046 + ... + 40861.

It is an arithmetic number, because the mean of its divisors is an integer number (10627764).

Almost surely, 2^72555556 is an apocalyptic number.

It is an amenable number.

72555556 is a deficient number, since it is larger than the sum of its proper divisors (54977612).

72555556 is a wasteful number, since it uses less digits than its factorization.

72555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80138 (or 80136 counting only the distinct ones).

The product of its digits is 262500, while the sum is 40.

The square root of 72555556 is about 8517.9549188758. The cubic root of 72555556 is about 417.0840271028.

The spelling of 72555556 in words is "seventy-two million, five hundred fifty-five thousand, five hundred fifty-six".