18068640 has 48 divisors (see below), whose sum is σ = 56917728. Its totient is φ = 4818176.

The previous prime is 18068621. The next prime is 18068647. The reversal of 18068640 is 4686081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18068647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18342 + ... + 19301.

It is an arithmetic number, because the mean of its divisors is an integer number (1185786).

Almost surely, 2^18068640 is an apocalyptic number.

18068640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18068640 is an abundant number, since it is smaller than the sum of its proper divisors (38849088).

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

18068640 is a wasteful number, since it uses less digits than its factorization.

18068640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37661 (or 37653 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 18068640 is about 4250.7222915641. The cubic root of 18068640 is about 262.4068422269.

The spelling of 18068640 in words is "eighteen million, sixty-eight thousand, six hundred forty".