6881687 has 4 divisors (see below), whose sum is σ = 6888696. Its totient is φ = 6874680.

The previous prime is 6881683. The next prime is 6881713. The reversal of 6881687 is 7861886.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6881687 - 2² = 6881683 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6881683) 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, 1733 + ... + 4094.

It is an arithmetic number, because the mean of its divisors is an integer number (1722174).

Almost surely, 2^6881687 is an apocalyptic number.

6881687 is a deficient number, since it is larger than the sum of its proper divisors (7009).

6881687 is a wasteful number, since it uses less digits than its factorization.

6881687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008.

The product of its digits is 129024, while the sum is 44.

The square root of 6881687 is about 2623.2969713702. The cubic root of 6881687 is about 190.2092523777.

The spelling of 6881687 in words is "six million, eight hundred eighty-one thousand, six hundred eighty-seven".