22188816 has 120 divisors (see below), whose sum is σ = 69509440. Its totient is φ = 6811776.

The previous prime is 22188797. The next prime is 22188833. The reversal of 22188816 is 61888122.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 50325 + ... + 50763.

Almost surely, 2^22188816 is an apocalyptic number.

22188816 is a gapful number since it is divisible by the number (26) 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 22188816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34754720).

22188816 is an abundant number, since it is smaller than the sum of its proper divisors (47320624).

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

22188816 is a wasteful number, since it uses less digits than its factorization.

22188816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 457 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 22188816 is about 4710.5006103386. The cubic root of 22188816 is about 281.0032716192.

The spelling of 22188816 in words is "twenty-two million, one hundred eighty-eight thousand, eight hundred sixteen".