22178228 has 6 divisors (see below), whose sum is σ = 38811906. Its totient is φ = 11089112.

The previous prime is 22178213. The next prime is 22178231. The reversal of 22178228 is 82287122.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 9872164 = 3508^2 + 3142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22178194 and 22178203.

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, 2772275 + ... + 2772282.

It is an arithmetic number, because the mean of its divisors is an integer number (6468651).

Almost surely, 2^22178228 is an apocalyptic number.

It is an amenable number.

22178228 is a deficient number, since it is larger than the sum of its proper divisors (16633678).

22178228 is a wasteful number, since it uses less digits than its factorization.

22178228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544561 (or 5544559 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 22178228 is about 4709.3766041802. The cubic root of 22178228 is about 280.9585683776.

The spelling of 22178228 in words is "twenty-two million, one hundred seventy-eight thousand, two hundred twenty-eight".