18787668 has 24 divisors (see below), whose sum is σ = 44011968. Its totient is φ = 6237696.

The previous prime is 18787663. The next prime is 18787709. The reversal of 18787668 is 86678781.

It is a self number, because there is not a number n which added to its sum of digits gives 18787668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18787663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180 + ... + 6132.

It is an arithmetic number, because the mean of its divisors is an integer number (1833832).

Almost surely, 2^18787668 is an apocalyptic number.

It is an amenable number.

18787668 is an abundant number, since it is smaller than the sum of its proper divisors (25224300).

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

18787668 is a wasteful number, since it uses less digits than its factorization.

18787668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6223 (or 6221 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 18787668 is about 4334.4743625958. The cubic root of 18787668 is about 265.8424265082.

The spelling of 18787668 in words is "eighteen million, seven hundred eighty-seven thousand, six hundred sixty-eight".