6778769 has 2 divisors, whose sum is σ = 6778770. Its totient is φ = 6778768.

The previous prime is 6778741. The next prime is 6778777. The reversal of 6778769 is 9678776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 18769 = 2600^2 + 137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778769 is a prime.

It is a super-2 number, since 2×6778769² = 91903418310722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6778799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389384 + 3389385.

It is an arithmetic number, because the mean of its divisors is an integer number (3389385).

Almost surely, 2^6778769 is an apocalyptic number.

It is an amenable number.

6778769 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778769 is an equidigital number, since it uses as much as digits as its factorization.

6778769 is an evil number, because the sum of its binary digits is even.

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

The square root of 6778769 is about 2603.6069211769. The cubic root of 6778769 is about 189.2562707801.

The spelling of 6778769 in words is "six million, seven hundred seventy-eight thousand, seven hundred sixty-nine".