18667228 has 6 divisors (see below), whose sum is σ = 32667656. Its totient is φ = 9333612.

The previous prime is 18667223. The next prime is 18667247. The reversal of 18667228 is 82276681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18667223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2333400 + ... + 2333407.

Almost surely, 2^18667228 is an apocalyptic number.

It is an amenable number.

18667228 is a deficient number, since it is larger than the sum of its proper divisors (14000428).

18667228 is a wasteful number, since it uses less digits than its factorization.

18667228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666811 (or 4666809 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 18667228 is about 4320.5587601605. The cubic root of 18667228 is about 265.2731395205.

The spelling of 18667228 in words is "eighteen million, six hundred sixty-seven thousand, two hundred twenty-eight".