72318186 has 36 divisors (see below), whose sum is σ = 159126786. Its totient is φ = 23736720.

The previous prime is 72318173. The next prime is 72318203. The reversal of 72318186 is 68181327.

It can be written as a sum of positive squares in only one way, i.e., 62110161 + 10208025 = 7881^2 + 3195^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 72318186.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 90340 + ... + 91136.

Almost surely, 2^72318186 is an apocalyptic number.

72318186 is an abundant number, since it is smaller than the sum of its proper divisors (86808600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72318186 is a wasteful number, since it uses less digits than its factorization.

72318186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 873 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 72318186 is about 8504.0099952905. The cubic root of 72318186 is about 416.6286914368.

The spelling of 72318186 in words is "seventy-two million, three hundred eighteen thousand, one hundred eighty-six".