18778764 has 48 divisors (see below), whose sum is σ = 48142080. Its totient is φ = 5670720.

The previous prime is 18778757. The next prime is 18778807. The reversal of 18778764 is 46787781.

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 15 ways as a sum of consecutive naturals, for example, 3454 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (1002960).

Almost surely, 2^18778764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18778764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24071040).

18778764 is an abundant number, since it is smaller than the sum of its proper divisors (29363316).

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

18778764 is a wasteful number, since it uses less digits than its factorization.

18778764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630 (or 3628 counting only the distinct ones).

The product of its digits is 526848, while the sum is 48.

The square root of 18778764 is about 4333.4471267110. The cubic root of 18778764 is about 265.8004231579.

The spelling of 18778764 in words is "eighteen million, seven hundred seventy-eight thousand, seven hundred sixty-four".