18328816 has 40 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 8276160.

The previous prime is 18328811. The next prime is 18328823. The reversal of 18328816 is 61882381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39015 + ... + 39481.

Almost surely, 2^18328816 is an apocalyptic number.

18328816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18328816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19498752).

18328816 is an abundant number, since it is smaller than the sum of its proper divisors (20668688).

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

18328816 is a wasteful number, since it uses less digits than its factorization.

18328816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 703 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 18328816 is about 4281.2166495051. The cubic root of 18328816 is about 263.6603375885.

It can be divided in two parts, 1832 and 8816, that added together give a cube (10648 = 22³).

The spelling of 18328816 in words is "eighteen million, three hundred twenty-eight thousand, eight hundred sixteen".