6768781 has 2 divisors, whose sum is σ = 6768782. Its totient is φ = 6768780.

The previous prime is 6768761. The next prime is 6768793. The reversal of 6768781 is 1878676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6325225 + 443556 = 2515^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 6768781 - 2⁷ = 6768653 is a prime.

It is a super-2 number, since 2×6768781² = 91632792451922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6768701) 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 as a sum of consecutive naturals, namely, 3384390 + 3384391.

It is an arithmetic number, because the mean of its divisors is an integer number (3384391).

Almost surely, 2^6768781 is an apocalyptic number.

It is an amenable number.

6768781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6768781 is an equidigital number, since it uses as much as digits as its factorization.

6768781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 6768781 is about 2601.6881058267. The cubic root of 6768781 is about 189.1632735219.

The spelling of 6768781 in words is "six million, seven hundred sixty-eight thousand, seven hundred eighty-one".