72228918 has 32 divisors (see below), whose sum is σ = 152490240. Its totient is φ = 22744800.

The previous prime is 72228917. The next prime is 72228931. The reversal of 72228918 is 81982227.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72228913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54868 + ... + 56168.

It is an arithmetic number, because the mean of its divisors is an integer number (4765320).

Almost surely, 2^72228918 is an apocalyptic number.

72228918 is an abundant number, since it is smaller than the sum of its proper divisors (80261322).

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

72228918 is a wasteful number, since it uses less digits than its factorization.

72228918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812.

The product of its digits is 32256, while the sum is 39.

The square root of 72228918 is about 8498.7597918755. The cubic root of 72228918 is about 416.4571950474.

The spelling of 72228918 in words is "seventy-two million, two hundred twenty-eight thousand, nine hundred eighteen".