18128664 has 64 divisors (see below), whose sum is σ = 53330400. Its totient is φ = 5686272.

The previous prime is 18128609. The next prime is 18128687. The reversal of 18128664 is 46682181.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 1204 + ... + 6140.

Almost surely, 2^18128664 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 18128664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26665200).

18128664 is an abundant number, since it is smaller than the sum of its proper divisors (35201736).

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

18128664 is a wasteful number, since it uses less digits than its factorization.

18128664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4969 (or 4959 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18128664 is about 4257.7768847134. The cubic root of 18128664 is about 262.6970927962.

The spelling of 18128664 in words is "eighteen million, one hundred twenty-eight thousand, six hundred sixty-four".