6809665 has 8 divisors (see below), whose sum is σ = 8392680. Its totient is φ = 5300352.

The previous prime is 6809653. The next prime is 6809669. The reversal of 6809665 is 5669086.

It can be written as a sum of positive squares in 4 ways, for example, as 1468944 + 5340721 = 1212^2 + 2311^2 .

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 6809665 - 2¹⁷ = 6678593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6809669) 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 7 ways as a sum of consecutive naturals, for example, 18220 + ... + 18589.

It is an arithmetic number, because the mean of its divisors is an integer number (1049085).

Almost surely, 2^6809665 is an apocalyptic number.

It is an amenable number.

6809665 is a deficient number, since it is larger than the sum of its proper divisors (1583015).

6809665 is a wasteful number, since it uses less digits than its factorization.

6809665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36851.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 6809665 is about 2609.5334832111. The cubic root of 6809665 is about 189.5433632545.

The spelling of 6809665 in words is "six million, eight hundred nine thousand, six hundred sixty-five".