6777689 has 4 divisors (see below), whose sum is σ = 6791220. Its totient is φ = 6764160.

The previous prime is 6777637. The next prime is 6777691. The reversal of 6777689 is 9867776.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1638400 + 5139289 = 1280^2 + 2267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6777689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6777629) 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, 5984 + ... + 7025.

It is an arithmetic number, because the mean of its divisors is an integer number (1697805).

Almost surely, 2^6777689 is an apocalyptic number.

It is an amenable number.

6777689 is a deficient number, since it is larger than the sum of its proper divisors (13531).

6777689 is a wasteful number, since it uses less digits than its factorization.

6777689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13530.

The product of its digits is 889056, while the sum is 50.

The square root of 6777689 is about 2603.3995083352. The cubic root of 6777689 is about 189.2462194159.

The spelling of 6777689 in words is "six million, seven hundred seventy-seven thousand, six hundred eighty-nine".