72551618 has 8 divisors (see below), whose sum is σ = 108915600. Its totient is φ = 36246420.

The previous prime is 72551603. The next prime is 72551627. The reversal of 72551618 is 81615527.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 11468 + ... + 16631.

It is an arithmetic number, because the mean of its divisors is an integer number (13614450).

Almost surely, 2^72551618 is an apocalyptic number.

72551618 is a deficient number, since it is larger than the sum of its proper divisors (36363982).

72551618 is a wasteful number, since it uses less digits than its factorization.

72551618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29392.

The product of its digits is 16800, while the sum is 35.

The square root of 72551618 is about 8517.7237569670. The cubic root of 72551618 is about 417.0764811307.

The spelling of 72551618 in words is "seventy-two million, five hundred fifty-one thousand, six hundred eighteen".