22638180 has 48 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 6012288.

The previous prime is 22638173. The next prime is 22638193. The reversal of 22638180 is 8183622.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17806 + ... + 19034.

It is an arithmetic number, because the mean of its divisors is an integer number (1325940).

Almost surely, 2^22638180 is an apocalyptic number.

22638180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22638180 is an abundant number, since it is smaller than the sum of its proper divisors (41006940).

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

22638180 is a wasteful number, since it uses less digits than its factorization.

22638180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 22638180 is about 4757.9596467393. The cubic root of 22638180 is about 282.8875512078.

22638180 divided by its sum of digits (30) gives a triangular number (754606 = T₁₂₂₈).

The spelling of 22638180 in words is "twenty-two million, six hundred thirty-eight thousand, one hundred eighty".