72222288 has 20 divisors (see below), whose sum is σ = 186574368. Its totient is φ = 24074080.

The previous prime is 72222263. The next prime is 72222289. The reversal of 72222288 is 88222227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752268 + ... + 752363.

Almost surely, 2^72222288 is an apocalyptic number.

It is an amenable number.

72222288 is an abundant number, since it is smaller than the sum of its proper divisors (114352080).

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

72222288 is a wasteful number, since it uses less digits than its factorization.

72222288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504642 (or 1504636 counting only the distinct ones).

The product of its digits is 14336, while the sum is 33.

The square root of 72222288 is about 8498.3697260122. The cubic root of 72222288 is about 416.4444522487. Note that the first 4 decimals are identical.

It can be divided in two parts, 722222 and 88, that multiplied together give a palindrome (63555536).

The spelling of 72222288 in words is "seventy-two million, two hundred twenty-two thousand, two hundred eighty-eight".