22238640 has 120 divisors (see below), whose sum is σ = 75963888. Its totient is φ = 5829120.

The previous prime is 22238639. The next prime is 22238663. The reversal of 22238640 is 4683222.

It is a tau number, because it is divible by the number of its divisors (120).

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, 48010 + ... + 48470.

Almost surely, 2^22238640 is an apocalyptic number.

22238640 is a gapful number since it is divisible by the number (20) 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 22238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37981944).

22238640 is an abundant number, since it is smaller than the sum of its proper divisors (53725248).

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

22238640 is a wasteful number, since it uses less digits than its factorization.

22238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 22238640 is about 4715.7862546981. The cubic root of 22238640 is about 281.2134411740.

The spelling of 22238640 in words is "twenty-two million, two hundred thirty-eight thousand, six hundred forty".