666887 has 8 divisors (see below), whose sum is σ = 735504. Its totient is φ = 600768.

The previous prime is 666871. The next prime is 666889. The reversal of 666887 is 788666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666887 - 2⁴ = 666871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666887.

It is not an unprimeable number, because it can be changed into a prime (666889) 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, 38 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (91938).

2⁶⁶⁶⁸⁸⁷ is an apocalyptic number.

666887 is a deficient number, since it is larger than the sum of its proper divisors (68617).

666887 is a wasteful number, since it uses less digits than its factorization.

666887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its digits is 96768, while the sum is 41.

The square root of 666887 is about 816.6314958413. The cubic root of 666887 is about 87.3676693584.

The spelling of 666887 in words is "six hundred sixty-six thousand, eight hundred eighty-seven".