6687847 has 4 divisors (see below), whose sum is σ = 6903616. Its totient is φ = 6472080.

The previous prime is 6687823. The next prime is 6687853. The reversal of 6687847 is 7487866.

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 6687847 - 2¹¹ = 6685799 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 6687797 and 6687806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107838 + ... + 107899.

It is an arithmetic number, because the mean of its divisors is an integer number (1725904).

Almost surely, 2^6687847 is an apocalyptic number.

6687847 is a deficient number, since it is larger than the sum of its proper divisors (215769).

6687847 is a wasteful number, since it uses less digits than its factorization.

6687847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215768.

The product of its digits is 451584, while the sum is 46.

The square root of 6687847 is about 2586.0871988392. The cubic root of 6687847 is about 188.4063096382.

It can be divided in two parts, 668 and 7847, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 6687847 in words is "six million, six hundred eighty-seven thousand, eight hundred forty-seven".