22981872 has 80 divisors (see below), whose sum is σ = 61996032. Its totient is φ = 7330560.

The previous prime is 22981867. The next prime is 22981873. The reversal of 22981872 is 27818922.

It is a self number, because there is not a number n which added to its sum of digits gives 22981872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22981873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137533 + ... + 137699.

Almost surely, 2^22981872 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 22981872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30998016).

22981872 is an abundant number, since it is smaller than the sum of its proper divisors (39014160).

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

22981872 is a wasteful number, since it uses less digits than its factorization.

22981872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 22981872 is about 4793.9411761097. The cubic root of 22981872 is about 284.3119629548.

The spelling of 22981872 in words is "twenty-two million, nine hundred eighty-one thousand, eight hundred seventy-two".