18663764 has 48 divisors (see below), whose sum is σ = 39583488. Its totient is φ = 7527168.

The previous prime is 18663761. The next prime is 18663779. The reversal of 18663764 is 46736681.

It is a cake number, because a cake can be divided into 18663764 parts by 482 planar cuts.

Its product of digits (145152) is a multiple of the sum of its prime factors (504).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18663761) 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 15 ways as a sum of consecutive naturals, for example, 46814 + ... + 47210.

It is an arithmetic number, because the mean of its divisors is an integer number (824656).

Almost surely, 2^18663764 is an apocalyptic number.

18663764 is a gapful number since it is divisible by the number (14) 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 18663764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19791744).

18663764 is an abundant number, since it is smaller than the sum of its proper divisors (20919724).

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

18663764 is a wasteful number, since it uses less digits than its factorization.

18663764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504 (or 502 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 18663764 is about 4320.1578674859. The cubic root of 18663764 is about 265.2567299604.

The spelling of 18663764 in words is "eighteen million, six hundred sixty-three thousand, seven hundred sixty-four".