72222136 has 32 divisors (see below), whose sum is σ = 157392000. Its totient is φ = 30426336.

The previous prime is 72222131. The next prime is 72222149. The reversal of 72222136 is 63122227.

It is a self number, because there is not a number n which added to its sum of digits gives 72222136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222131) 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 7 ways as a sum of consecutive naturals, for example, 7626 + ... + 14233.

It is an arithmetic number, because the mean of its divisors is an integer number (4918500).

Almost surely, 2^72222136 is an apocalyptic number.

It is an amenable number.

72222136 is an abundant number, since it is smaller than the sum of its proper divisors (85169864).

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

72222136 is a wasteful number, since it uses less digits than its factorization.

72222136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21931 (or 21927 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 72222136 is about 8498.3607831158. The cubic root of 72222136 is about 416.4441600969. Note that the first 3 decimals are identical.

Subtracting from 72222136 its reverse (63122227), we obtain a palindrome (9099909).

The spelling of 72222136 in words is "seventy-two million, two hundred twenty-two thousand, one hundred thirty-six".