22544640 has 216 divisors, whose sum is σ = 82904640. Its totient is φ = 5640192.

The previous prime is 22544617. The next prime is 22544651. The reversal of 22544640 is 4644522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218829 + ... + 218931.

Almost surely, 2^22544640 is an apocalyptic number.

22544640 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 22544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41452320).

22544640 is an abundant number, since it is smaller than the sum of its proper divisors (60360000).

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

22544640 is a wasteful number, since it uses less digits than its factorization.

22544640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 22544640 is about 4748.1196278106. The cubic root of 22544640 is about 282.4973868764.

The spelling of 22544640 in words is "twenty-two million, five hundred forty-four thousand, six hundred forty".