22636640 has 48 divisors (see below), whose sum is σ = 57598128. Its totient is φ = 8357376.

The previous prime is 22636631. The next prime is 22636661. The reversal of 22636640 is 4663622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3362 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (1199961).

Almost surely, 2^22636640 is an apocalyptic number.

22636640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22636640 is an abundant number, since it is smaller than the sum of its proper divisors (34961488).

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

22636640 is a wasteful number, since it uses less digits than its factorization.

22636640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10911 (or 10903 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 22636640 is about 4757.7978099116. The cubic root of 22636640 is about 282.8811364296.

It can be divided in two parts, 226366 and 40, that multiplied together give a triangular number (9054640 = T₄₂₅₅).

The spelling of 22636640 in words is "twenty-two million, six hundred thirty-six thousand, six hundred forty".