72187504 has 20 divisors (see below), whose sum is σ = 139998976. Its totient is φ = 36058752.

The previous prime is 72187487. The next prime is 72187541. The reversal of 72187504 is 40578127.

It is a happy number.

It is a super-2 number, since 2×72187504² = 10422071467500032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72187504.

It is a congruent number.

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, 25252 + ... + 27964.

Almost surely, 2^72187504 is an apocalyptic number.

It is an amenable number.

72187504 is a deficient number, since it is larger than the sum of its proper divisors (67811472).

72187504 is a wasteful number, since it uses less digits than its factorization.

72187504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384 (or 4378 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 72187504 is about 8496.3229693792. The cubic root of 72187504 is about 416.3775849404.

The spelling of 72187504 in words is "seventy-two million, one hundred eighty-seven thousand, five hundred four".