6886687 has 4 divisors (see below), whose sum is σ = 6914376. Its totient is φ = 6859000.

The previous prime is 6886679. The next prime is 6886727. The reversal of 6886687 is 7866886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6886687 - 2³ = 6886679 is a prime.

It is a Duffinian number.

6886687 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6886687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6886387) 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, 13468 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (1728594).

Almost surely, 2^6886687 is an apocalyptic number.

6886687 is a deficient number, since it is larger than the sum of its proper divisors (27689).

6886687 is a wasteful number, since it uses less digits than its factorization.

6886687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27688.

The product of its digits is 774144, while the sum is 49.

The square root of 6886687 is about 2624.2497975612. The cubic root of 6886687 is about 190.2553077525.

The spelling of 6886687 in words is "six million, eight hundred eighty-six thousand, six hundred eighty-seven".