22551728 has 20 divisors (see below), whose sum is σ = 44625120. Its totient is φ = 11035584.

The previous prime is 22551721. The next prime is 22551743. The reversal of 22551728 is 82715522.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22551694 and 22551703.

It is not an unprimeable number, because it can be changed into a prime (22551721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14243 + ... + 15746.

It is an arithmetic number, because the mean of its divisors is an integer number (2231256).

Almost surely, 2^22551728 is an apocalyptic number.

It is an amenable number.

22551728 is a deficient number, since it is larger than the sum of its proper divisors (22073392).

22551728 is a wasteful number, since it uses less digits than its factorization.

22551728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30044 (or 30038 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 22551728 is about 4748.8659698922. The cubic root of 22551728 is about 282.5269893550.

The spelling of 22551728 in words is "twenty-two million, five hundred fifty-one thousand, seven hundred twenty-eight".