22531228 has 6 divisors (see below), whose sum is σ = 39429656. Its totient is φ = 11265612.

The previous prime is 22531217. The next prime is 22531241. The reversal of 22531228 is 82213522.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2816400 + ... + 2816407.

Almost surely, 2^22531228 is an apocalyptic number.

It is an amenable number.

22531228 is a deficient number, since it is larger than the sum of its proper divisors (16898428).

22531228 is a wasteful number, since it uses less digits than its factorization.

22531228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632811 (or 5632809 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 22531228 is about 4746.7070691164. The cubic root of 22531228 is about 282.4413557231.

It can be divided in two parts, 2253 and 1228, that added together give a square (3481 = 59²).

The spelling of 22531228 in words is "twenty-two million, five hundred thirty-one thousand, two hundred twenty-eight".