22444428 has 12 divisors (see below), whose sum is σ = 52370360. Its totient is φ = 7481472.

The previous prime is 22444423. The next prime is 22444439. The reversal of 22444428 is 82444422.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 22444395 and 22444404.

It is not an unprimeable number, because it can be changed into a prime (22444423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935173 + ... + 935196.

Almost surely, 2^22444428 is an apocalyptic number.

It is an amenable number.

22444428 is an abundant number, since it is smaller than the sum of its proper divisors (29925932).

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

22444428 is a wasteful number, since it uses less digits than its factorization.

22444428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870376 (or 1870374 counting only the distinct ones).

The product of its digits is 16384, while the sum is 30.

The square root of 22444428 is about 4737.5550656430. Note that the first 3 decimals coincide. The cubic root of 22444428 is about 282.0781936978.

The spelling of 22444428 in words is "twenty-two million, four hundred forty-four thousand, four hundred twenty-eight".