18728336 has 20 divisors (see below), whose sum is σ = 39585264. Its totient is φ = 8512800.

The previous prime is 18728323. The next prime is 18728363. The reversal of 18728336 is 63382781.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18728336.

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 in 3 ways as a sum of consecutive naturals, for example, 53030 + ... + 53381.

Almost surely, 2^18728336 is an apocalyptic number.

18728336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18728336 is an abundant number, since it is smaller than the sum of its proper divisors (20856928).

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

18728336 is a wasteful number, since it uses less digits than its factorization.

18728336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106430 (or 106424 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 18728336 is about 4327.6247526790. The cubic root of 18728336 is about 265.5622853740.

The spelling of 18728336 in words is "eighteen million, seven hundred twenty-eight thousand, three hundred thirty-six".