18566228 has 6 divisors (see below), whose sum is σ = 32490906. Its totient is φ = 9283112.

The previous prime is 18566213. The next prime is 18566263. The reversal of 18566228 is 82266581.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 4443664 = 3758^2 + 2108^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18566191 and 18566200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2320775 + ... + 2320782.

It is an arithmetic number, because the mean of its divisors is an integer number (5415151).

Almost surely, 2^18566228 is an apocalyptic number.

It is an amenable number.

18566228 is a deficient number, since it is larger than the sum of its proper divisors (13924678).

18566228 is a wasteful number, since it uses less digits than its factorization.

18566228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641561 (or 4641559 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 18566228 is about 4308.8546041843. The cubic root of 18566228 is about 264.7938494021.

The spelling of 18566228 in words is "eighteen million, five hundred sixty-six thousand, two hundred twenty-eight".