22997772 has 72 divisors (see below), whose sum is σ = 66882816. Its totient is φ = 6526944.

The previous prime is 22997759. The next prime is 22997773. The reversal of 22997772 is 27779922.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22997773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66103 + ... + 66449.

It is an arithmetic number, because the mean of its divisors is an integer number (928928).

Almost surely, 2^22997772 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 22997772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33441408).

22997772 is an abundant number, since it is smaller than the sum of its proper divisors (43885044).

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

22997772 is a wasteful number, since it uses less digits than its factorization.

22997772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 622 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 22997772 is about 4795.5992326298. The cubic root of 22997772 is about 284.3775148834.

The spelling of 22997772 in words is "twenty-two million, nine hundred ninety-seven thousand, seven hundred seventy-two".