18378828 has 72 divisors (see below), whose sum is σ = 50542128. Its totient is φ = 5597568.

The previous prime is 18378827. The next prime is 18378839. The reversal of 18378828 is 82887381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18378821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80851 + ... + 81077.

It is an arithmetic number, because the mean of its divisors is an integer number (701974).

Almost surely, 2^18378828 is an apocalyptic number.

18378828 is a gapful number since it is divisible by the number (18) 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 18378828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25271064).

18378828 is an abundant number, since it is smaller than the sum of its proper divisors (32163300).

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

18378828 is a wasteful number, since it uses less digits than its factorization.

18378828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 418 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 18378828 is about 4287.0535336056. The cubic root of 18378828 is about 263.8999276359.

The spelling of 18378828 in words is "eighteen million, three hundred seventy-eight thousand, eight hundred twenty-eight".