72522231 has 8 divisors (see below), whose sum is σ = 96741744. Its totient is φ = 48325440.

The previous prime is 72522227. The next prime is 72522251. The reversal of 72522231 is 13222527.

It is a happy number.

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

It is not a de Polignac number, because 72522231 - 2² = 72522227 is a prime.

It is a super-2 number, since 2×72522231² = 10518947978434722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72522211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4251 + ... + 12771.

It is an arithmetic number, because the mean of its divisors is an integer number (12092718).

Almost surely, 2^72522231 is an apocalyptic number.

72522231 is a deficient number, since it is larger than the sum of its proper divisors (24219513).

72522231 is a wasteful number, since it uses less digits than its factorization.

72522231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11361.

The product of its digits is 1680, while the sum is 24.

The square root of 72522231 is about 8515.9985321746. The cubic root of 72522231 is about 417.0201613127.

Adding to 72522231 its reverse (13222527), we get a palindrome (85744758).

The spelling of 72522231 in words is "seventy-two million, five hundred twenty-two thousand, two hundred thirty-one".