22638636 has 48 divisors (see below), whose sum is σ = 59325280. Its totient is φ = 7464960.

The previous prime is 22638617. The next prime is 22638643. The reversal of 22638636 is 63683622.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22638636.

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, 9396 + ... + 11556.

Almost surely, 2^22638636 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 22638636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29662640).

22638636 is an abundant number, since it is smaller than the sum of its proper divisors (36686644).

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

22638636 is a wasteful number, since it uses less digits than its factorization.

22638636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271 (or 2263 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 22638636 is about 4758.0075661983. The cubic root of 22638636 is about 282.8894505928.

The spelling of 22638636 in words is "twenty-two million, six hundred thirty-eight thousand, six hundred thirty-six".