72231816 has 16 divisors (see below), whose sum is σ = 180579600. Its totient is φ = 24077264.

The previous prime is 72231811. The next prime is 72231857. The reversal of 72231816 is 61813227.

It is not an unprimeable number, because it can be changed into a prime (72231811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504806 + ... + 1504853.

It is an arithmetic number, because the mean of its divisors is an integer number (11286225).

Almost surely, 2^72231816 is an apocalyptic number.

It is an amenable number.

72231816 is an abundant number, since it is smaller than the sum of its proper divisors (108347784).

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

72231816 is a wasteful number, since it uses less digits than its factorization.

72231816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3009668 (or 3009664 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 72231816 is about 8498.9302856301. The cubic root of 72231816 is about 416.4627647317.

The spelling of 72231816 in words is "seventy-two million, two hundred thirty-one thousand, eight hundred sixteen".