6687871 has 8 divisors (see below), whose sum is σ = 7008480. Its totient is φ = 6369792.

The previous prime is 6687869. The next prime is 6687881. The reversal of 6687871 is 1787866.

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 6687871 - 2¹ = 6687869 is a prime.

It is a Duffinian number.

6687871 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687881) 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, 6735 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (876060).

Almost surely, 2^6687871 is an apocalyptic number.

6687871 is a deficient number, since it is larger than the sum of its proper divisors (320609).

6687871 is a wasteful number, since it uses less digits than its factorization.

6687871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265.

The product of its digits is 112896, while the sum is 43.

The square root of 6687871 is about 2586.0918390498. The cubic root of 6687871 is about 188.4065350095.

The spelling of 6687871 in words is "six million, six hundred eighty-seven thousand, eight hundred seventy-one".