22688244 has 18 divisors (see below), whose sum is σ = 57350930. Its totient is φ = 7562736.

The previous prime is 22688231. The next prime is 22688257. The reversal of 22688244 is 44288622.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22688231) and next prime (22688257).

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 9072144 = 3690^2 + 3012^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 630229 = 22688244 / (2 + 2 + 6 + 8 + 8 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 22688199 and 22688208.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 315079 + ... + 315150.

Almost surely, 2^22688244 is an apocalyptic number.

It is an amenable number.

22688244 is an abundant number, since it is smaller than the sum of its proper divisors (34662686).

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

22688244 is a wasteful number, since it uses less digits than its factorization.

22688244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630239 (or 630234 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

The square root of 22688244 is about 4763.2178199196. The cubic root of 22688244 is about 283.0959315507.

Adding to 22688244 its product of digits (49152), we get a triangular number (22737396 = T₆₇₄₃).

The spelling of 22688244 in words is "twenty-two million, six hundred eighty-eight thousand, two hundred forty-four".