6731689 has 8 divisors (see below), whose sum is σ = 6910920. Its totient is φ = 6554496.

The previous prime is 6731657. The next prime is 6731707. The reversal of 6731689 is 9861376.

It can be written as a sum of positive squares in 4 ways, for example, as 2250000 + 4481689 = 1500^2 + 2117^2 .

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 6731689 - 2⁵ = 6731657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6731639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7917 + ... + 8725.

It is an arithmetic number, because the mean of its divisors is an integer number (863865).

Almost surely, 2^6731689 is an apocalyptic number.

It is an amenable number.

6731689 is a deficient number, since it is larger than the sum of its proper divisors (179231).

6731689 is a wasteful number, since it uses less digits than its factorization.

6731689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019.

The product of its digits is 54432, while the sum is 40.

The square root of 6731689 is about 2594.5498646201. The cubic root of 6731689 is about 188.8171107643.

The spelling of 6731689 in words is "six million, seven hundred thirty-one thousand, six hundred eighty-nine".