72222444 has 72 divisors (see below), whose sum is σ = 209431040. Its totient is φ = 20557152.

The previous prime is 72222433. The next prime is 72222457. The reversal of 72222444 is 44422227.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116367 + ... + 116985.

Almost surely, 2^72222444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72222444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104715520).

72222444 is an abundant number, since it is smaller than the sum of its proper divisors (137208596).

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

72222444 is a wasteful number, since it uses less digits than its factorization.

72222444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099 (or 1094 counting only the distinct ones).

The product of its digits is 7168, while the sum is 27.

The square root of 72222444 is about 8498.3789042381. The cubic root of 72222444 is about 416.4447520882. Note that the first 3 decimals are identical.

The spelling of 72222444 in words is "seventy-two million, two hundred twenty-two thousand, four hundred forty-four".