22499988 has 24 divisors (see below), whose sum is σ = 60000192. Its totient is φ = 6428544.

The previous prime is 22499977. The next prime is 22499989. The reversal of 22499988 is 88999422.

It is a self number, because there is not a number n which added to its sum of digits gives 22499988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22499989) 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, 133845 + ... + 134012.

It is an arithmetic number, because the mean of its divisors is an integer number (2500008).

Almost surely, 2^22499988 is an apocalyptic number.

22499988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22499988 is an abundant number, since it is smaller than the sum of its proper divisors (37500204).

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

22499988 is a wasteful number, since it uses less digits than its factorization.

22499988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267871 (or 267869 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 22499988 is about 4743.4152253413. The cubic root of 22499988 is about 282.3107584757.

The spelling of 22499988 in words is "twenty-two million, four hundred ninety-nine thousand, nine hundred eighty-eight".