22264440 has 128 divisors (see below), whose sum is σ = 74027520. Its totient is φ = 5312000.

The previous prime is 22264439. The next prime is 22264457. The reversal of 22264440 is 4446222.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 22264440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133237 + ... + 133403.

It is an arithmetic number, because the mean of its divisors is an integer number (578340).

Almost surely, 2^22264440 is an apocalyptic number.

22264440 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 22264440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37013760).

22264440 is an abundant number, since it is smaller than the sum of its proper divisors (51763080).

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

22264440 is a wasteful number, since it uses less digits than its factorization.

22264440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 22264440 is about 4718.5209547060. The cubic root of 22264440 is about 281.3221484039.

It can be divided in two parts, 2226 and 4440, that added together give a palindrome (6666).

The spelling of 22264440 in words is "twenty-two million, two hundred sixty-four thousand, four hundred forty".