6404720779 has 2 divisors, whose sum is σ = 6404720780. Its totient is φ = 6404720778.

The previous prime is 6404720759. The next prime is 6404720801. The reversal of 6404720779 is 9770274046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6404720779 - 2²⁷ = 6270503051 is a prime.

It is not a weakly prime, because it can be changed into another prime (6404720759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202360389 + 3202360390.

It is an arithmetic number, because the mean of its divisors is an integer number (3202360390).

Almost surely, 2^6404720779 is an apocalyptic number.

6404720779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404720779 is an equidigital number, since it uses as much as digits as its factorization.

6404720779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 6404720779 is about 80029.4994298977. The cubic root of 6404720779 is about 1857.0919194812.

The spelling of 6404720779 in words is "six billion, four hundred four million, seven hundred twenty thousand, seven hundred seventy-nine".