18287864 has 32 divisors (see below), whose sum is σ = 40543200. Its totient is φ = 7566720.

The previous prime is 18287849. The next prime is 18287881. The reversal of 18287864 is 46878281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4007 + ... + 7254.

It is an arithmetic number, because the mean of its divisors is an integer number (1266975).

Almost surely, 2^18287864 is an apocalyptic number.

18287864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18287864 is an abundant number, since it is smaller than the sum of its proper divisors (22255336).

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

18287864 is a wasteful number, since it uses less digits than its factorization.

18287864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11303 (or 11299 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 18287864 is about 4276.4312224096. The cubic root of 18287864 is about 263.4638260829.

The spelling of 18287864 in words is "eighteen million, two hundred eighty-seven thousand, eight hundred sixty-four".