72222213 has 8 divisors (see below), whose sum is σ = 110052928. Its totient is φ = 41269824.

The previous prime is 72222193. The next prime is 72222229. The reversal of 72222213 is 31222227.

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 72222213 - 2⁶ = 72222149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3439153 = 72222213 / (7 + 2 + 2 + 2 + 2 + 2 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72222213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222253) 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, 1719556 + ... + 1719597.

It is an arithmetic number, because the mean of its divisors is an integer number (13756616).

Almost surely, 2^72222213 is an apocalyptic number.

It is an amenable number.

72222213 is a deficient number, since it is larger than the sum of its proper divisors (37830715).

72222213 is a wasteful number, since it uses less digits than its factorization.

72222213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439163.

The product of its digits is 672, while the sum is 21.

The square root of 72222213 is about 8498.3653134000. The cubic root of 72222213 is about 416.4443080949. Note that the first 3 decimals are identical.

The spelling of 72222213 in words is "seventy-two million, two hundred twenty-two thousand, two hundred thirteen".