18728328 has 16 divisors (see below), whose sum is σ = 46820880. Its totient is φ = 6242768.

The previous prime is 18728323. The next prime is 18728363. The reversal of 18728328 is 82382781.

It is not an unprimeable number, because it can be changed into a prime (18728321) by changing a digit.

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, 390150 + ... + 390197.

It is an arithmetic number, because the mean of its divisors is an integer number (2926305).

Almost surely, 2^18728328 is an apocalyptic number.

It is an amenable number.

18728328 is an abundant number, since it is smaller than the sum of its proper divisors (28092552).

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

18728328 is a wasteful number, since it uses less digits than its factorization.

18728328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780356 (or 780352 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 18728328 is about 4327.6238283843. The cubic root of 18728328 is about 265.5622475615.

The spelling of 18728328 in words is "eighteen million, seven hundred twenty-eight thousand, three hundred twenty-eight".