22565440 has 56 divisors (see below), whose sum is σ = 54205632. Its totient is φ = 8947200.

The previous prime is 22565423. The next prime is 22565441. The reversal of 22565440 is 4456522.

It is a junction number, because it is equal to n+sod(n) for n = 22565399 and 22565408.

It is not an unprimeable number, because it can be changed into a prime (22565441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48087 + ... + 48553.

Almost surely, 2^22565440 is an apocalyptic number.

22565440 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 22565440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27102816).

22565440 is an abundant number, since it is smaller than the sum of its proper divisors (31640192).

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

22565440 is a wasteful number, since it uses less digits than its factorization.

22565440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 22565440 is about 4750.3094636034. The cubic root of 22565440 is about 282.5842388509.

It can be divided in two parts, 22565 and 440, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 22565440 in words is "twenty-two million, five hundred sixty-five thousand, four hundred forty".