18071660 has 36 divisors (see below), whose sum is σ = 40069008. Its totient is φ = 6845472.

The previous prime is 18071639. The next prime is 18071671. The reversal of 18071660 is 6617081.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5969 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (1113028).

Almost surely, 2^18071660 is an apocalyptic number.

18071660 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 18071660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20034504).

18071660 is an abundant number, since it is smaller than the sum of its proper divisors (21997348).

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

18071660 is a wasteful number, since it uses less digits than its factorization.

18071660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2529 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18071660 is about 4251.0775104672. The cubic root of 18071660 is about 262.4214610087.

The spelling of 18071660 in words is "eighteen million, seventy-one thousand, six hundred sixty".