18268660 has 12 divisors (see below), whose sum is σ = 38364228. Its totient is φ = 7307456.

The previous prime is 18268643. The next prime is 18268661. The reversal of 18268660 is 6686281.

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 8054244 = 3196^2 + 2838^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18268661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456697 + ... + 456736.

It is an arithmetic number, because the mean of its divisors is an integer number (3197019).

Almost surely, 2^18268660 is an apocalyptic number.

18268660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18268660 is an abundant number, since it is smaller than the sum of its proper divisors (20095568).

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

18268660 is a wasteful number, since it uses less digits than its factorization.

18268660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913442 (or 913440 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18268660 is about 4274.1853024875. The cubic root of 18268660 is about 263.3715730756.

The spelling of 18268660 in words is "eighteen million, two hundred sixty-eight thousand, six hundred sixty".