22188864 has 56 divisors (see below), whose sum is σ = 59151520. Its totient is φ = 7340544.

The previous prime is 22188851. The next prime is 22188871. The reversal of 22188864 is 46888122.

It is a super-2 number, since 2×22188864² = 984691371220992, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30942 + ... + 31650.

Almost surely, 2^22188864 is an apocalyptic number.

22188864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22188864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29575760).

22188864 is an abundant number, since it is smaller than the sum of its proper divisors (36962656).

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

22188864 is a wasteful number, since it uses less digits than its factorization.

22188864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 877 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 22188864 is about 4710.5057053357. The cubic root of 22188864 is about 281.0034742460.

The spelling of 22188864 in words is "twenty-two million, one hundred eighty-eight thousand, eight hundred sixty-four".