22725144 has 64 divisors (see below), whose sum is σ = 67989600. Its totient is φ = 6991488.

The previous prime is 22725137. The next prime is 22725161. The reversal of 22725144 is 44152722.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239 + ... + 6854.

Almost surely, 2^22725144 is an apocalyptic number.

22725144 is a gapful number since it is divisible by the number (24) 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 22725144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33994800).

22725144 is an abundant number, since it is smaller than the sum of its proper divisors (45264456).

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

22725144 is a wasteful number, since it uses less digits than its factorization.

22725144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8121 (or 8111 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 22725144 is about 4767.0896781999. The cubic root of 22725144 is about 283.2493234976.

Adding to 22725144 its reverse (44152722), we get a palindrome (66877866).

The spelling of 22725144 in words is "twenty-two million, seven hundred twenty-five thousand, one hundred forty-four".