18649228 has 48 divisors (see below), whose sum is σ = 37933056. Its totient is φ = 7951680.

The previous prime is 18649223. The next prime is 18649231. The reversal of 18649228 is 82294681.

It is not an unprimeable number, because it can be changed into a prime (18649223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36825 + ... + 37327.

It is an arithmetic number, because the mean of its divisors is an integer number (790272).

Almost surely, 2^18649228 is an apocalyptic number.

It is an amenable number.

18649228 is an abundant number, since it is smaller than the sum of its proper divisors (19283828).

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

18649228 is a wasteful number, since it uses less digits than its factorization.

18649228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 572 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 18649228 is about 4318.4751938618. The cubic root of 18649228 is about 265.1878482982.

The spelling of 18649228 in words is "eighteen million, six hundred forty-nine thousand, two hundred twenty-eight".