18763864 has 48 divisors (see below), whose sum is σ = 41327280. Its totient is φ = 7963200.

The previous prime is 18763861. The next prime is 18763873. The reversal of 18763864 is 46836781.

It is a self number, because there is not a number n which added to its sum of digits gives 18763864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18763861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59034 + ... + 59350.

It is an arithmetic number, because the mean of its divisors is an integer number (860985).

Almost surely, 2^18763864 is an apocalyptic number.

18763864 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 18763864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20663640).

18763864 is an abundant number, since it is smaller than the sum of its proper divisors (22563416).

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

18763864 is a wasteful number, since it uses less digits than its factorization.

18763864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 477 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 18763864 is about 4331.7275999305. The cubic root of 18763864 is about 265.7301048233.

The spelling of 18763864 in words is "eighteen million, seven hundred sixty-three thousand, eight hundred sixty-four".