22542728 has 16 divisors (see below), whose sum is σ = 45519180. Its totient is φ = 10404288.

The previous prime is 22542727. The next prime is 22542739. The reversal of 22542728 is 82724522.

It can be written as a sum of positive squares in 2 ways, for example, as 17623204 + 4919524 = 4198^2 + 2218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22542694 and 22542703.

It is not an unprimeable number, because it can be changed into a prime (22542727) 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, 108275 + ... + 108482.

Almost surely, 2^22542728 is an apocalyptic number.

It is an amenable number.

22542728 is an abundant number, since it is smaller than the sum of its proper divisors (22976452).

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

22542728 is a wasteful number, since it uses less digits than its factorization.

22542728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216776 (or 216772 counting only the distinct ones).

The product of its digits is 17920, while the sum is 32.

The square root of 22542728 is about 4747.9182806784. The cubic root of 22542728 is about 282.4894004951.

The spelling of 22542728 in words is "twenty-two million, five hundred forty-two thousand, seven hundred twenty-eight".