22138688 has 112 divisors (see below), whose sum is σ = 53766720. Its totient is φ = 8908800.

The previous prime is 22138651. The next prime is 22138733. The reversal of 22138688 is 88683122.

It is a super-2 number, since 2×22138688² = 980243012722688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375203 + ... + 375261.

It is an arithmetic number, because the mean of its divisors is an integer number (480060).

Almost surely, 2^22138688 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 22138688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26883360).

22138688 is an abundant number, since it is smaller than the sum of its proper divisors (31628032).

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

22138688 is a wasteful number, since it uses less digits than its factorization.

22138688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 126 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 22138688 is about 4705.1767235674. The cubic root of 22138688 is about 280.7915019763.

It can be divided in two parts, 2213 and 8688, that added together give a palindrome (10901).

The spelling of 22138688 in words is "twenty-two million, one hundred thirty-eight thousand, six hundred eighty-eight".