6768409 has 2 divisors, whose sum is σ = 6768410. Its totient is φ = 6768408.

The previous prime is 6768383. The next prime is 6768413. The reversal of 6768409 is 9048676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5198400 + 1570009 = 2280^2 + 1253^2 .

It is a cyclic number.

It is not a de Polignac number, because 6768409 - 2⁹ = 6767897 is a prime.

It is a super-2 number, since 2×6768409² = 91622720782562, which contains 22 as substring.

6768409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6768449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3384204 + 3384205.

It is an arithmetic number, because the mean of its divisors is an integer number (3384205).

Almost surely, 2^6768409 is an apocalyptic number.

It is an amenable number.

6768409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6768409 is an equidigital number, since it uses as much as digits as its factorization.

6768409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6768409 is about 2601.6166128006. The cubic root of 6768409 is about 189.1598081009.

The spelling of 6768409 in words is "six million, seven hundred sixty-eight thousand, four hundred nine".