22638490 has 48 divisors (see below), whose sum is σ = 48460032. Its totient is φ = 7588896.

The previous prime is 22638479. The next prime is 22638491. The reversal of 22638490 is 9483622.

It is not an unprimeable number, because it can be changed into a prime (22638491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22539 + ... + 23521.

It is an arithmetic number, because the mean of its divisors is an integer number (1009584).

Almost surely, 2^22638490 is an apocalyptic number.

22638490 is an abundant number, since it is smaller than the sum of its proper divisors (25821542).

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

22638490 is a wasteful number, since it uses less digits than its factorization.

22638490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 22638490 is about 4757.9922236170. The cubic root of 22638490 is about 282.8888424591. Note that the first 4 decimals are identical.

The spelling of 22638490 in words is "twenty-two million, six hundred thirty-eight thousand, four hundred ninety".