22172988 has 24 divisors (see below), whose sum is σ = 52088400. Its totient is φ = 7340800.

The previous prime is 22172987. The next prime is 22173007. The reversal of 22172988 is 88927122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22172987) 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, 4413 + ... + 7988.

It is an arithmetic number, because the mean of its divisors is an integer number (2170350).

Almost surely, 2^22172988 is an apocalyptic number.

It is an amenable number.

22172988 is an abundant number, since it is smaller than the sum of its proper divisors (29915412).

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

22172988 is a wasteful number, since it uses less digits than its factorization.

22172988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12557 (or 12555 counting only the distinct ones).

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

The square root of 22172988 is about 4708.8202344112. The cubic root of 22172988 is about 280.9364394853.

The spelling of 22172988 in words is "twenty-two million, one hundred seventy-two thousand, nine hundred eighty-eight".