18027864 has 96 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 5644800.

The previous prime is 18027859. The next prime is 18027869. The reversal of 18027864 is 46872081.

It is an interprime number because it is at equal distance from previous prime (18027859) and next prime (18027869).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027869) 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, 91414 + ... + 91610.

It is an arithmetic number, because the mean of its divisors is an integer number (540540).

Almost surely, 2^18027864 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 18027864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25945920).

18027864 is an abundant number, since it is smaller than the sum of its proper divisors (33863976).

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

18027864 is a wasteful number, since it uses less digits than its factorization.

18027864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18027864 is about 4245.9232211617. The cubic root of 18027864 is about 262.2092999580.

The spelling of 18027864 in words is "eighteen million, twenty-seven thousand, eight hundred sixty-four".