6686889 has 16 divisors (see below), whose sum is σ = 9831360. Its totient is φ = 4008960.

The previous prime is 6686861. The next prime is 6686893. The reversal of 6686889 is 9886866.

It is not a de Polignac number, because 6686889 - 2⁵ = 6686857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6686489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157 + ... + 4245.

It is an arithmetic number, because the mean of its divisors is an integer number (614460).

Almost surely, 2^6686889 is an apocalyptic number.

It is an amenable number.

6686889 is a deficient number, since it is larger than the sum of its proper divisors (3144471).

6686889 is a wasteful number, since it uses less digits than its factorization.

6686889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200.

The product of its digits is 995328, while the sum is 51.

The square root of 6686889 is about 2585.9019702997. The cubic root of 6686889 is about 188.3973131274.

It can be divided in two parts, 668 and 6889, that added together give a palindrome (7557).

The spelling of 6686889 in words is "six million, six hundred eighty-six thousand, eight hundred eighty-nine".