6787639 has 2 divisors, whose sum is σ = 6787640. Its totient is φ = 6787638.

The previous prime is 6787637. The next prime is 6787643. The reversal of 6787639 is 9367876.

6787639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6787639 - 2¹ = 6787637 is a prime.

Together with 6787637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6787631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3393819 + 3393820.

It is an arithmetic number, because the mean of its divisors is an integer number (3393820).

Almost surely, 2^6787639 is an apocalyptic number.

6787639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6787639 is an equidigital number, since it uses as much as digits as its factorization.

6787639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The square root of 6787639 is about 2605.3097704496. The cubic root of 6787639 is about 189.3387818998.

The spelling of 6787639 in words is "six million, seven hundred eighty-seven thousand, six hundred thirty-nine".