18064640 has 72 divisors (see below), whose sum is σ = 47240928. Its totient is φ = 6563840.

The previous prime is 18064619. The next prime is 18064663. The reversal of 18064640 is 4646081.

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, 13439 + ... + 14721.

It is an arithmetic number, because the mean of its divisors is an integer number (656124).

Almost surely, 2^18064640 is an apocalyptic number.

18064640 is a gapful number since it is divisible by the number (10) 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 18064640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23620464).

18064640 is an abundant number, since it is smaller than the sum of its proper divisors (29176288).

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

18064640 is a wasteful number, since it uses less digits than its factorization.

18064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 18064640 is about 4250.2517572492. The cubic root of 18064640 is about 262.3874770942.

It can be divided in two parts, 1806 and 4640, that added together give a palindrome (6446).

The spelling of 18064640 in words is "eighteen million, sixty-four thousand, six hundred forty".