6779639 has 2 divisors, whose sum is σ = 6779640. Its totient is φ = 6779638.

The previous prime is 6779629. The next prime is 6779653. The reversal of 6779639 is 9369776.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6779639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6779593 and 6779602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6779629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389819 + 3389820.

It is an arithmetic number, because the mean of its divisors is an integer number (3389820).

Almost surely, 2^6779639 is an apocalyptic number.

6779639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6779639 is an equidigital number, since it uses as much as digits as its factorization.

6779639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 47.

The square root of 6779639 is about 2603.7739917282. The cubic root of 6779639 is about 189.2643669360.

The spelling of 6779639 in words is "six million, seven hundred seventy-nine thousand, six hundred thirty-nine".