779128388649 has 32 divisors (see below), whose sum is σ = 1243664620800. Its totient is φ = 479228037120.

The previous prime is 779128388639. The next prime is 779128388683. The reversal of 779128388649 is 946883821977.

It is not a de Polignac number, because 779128388649 - 2²⁰ = 779127340073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (779128388639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171369 + ... + 1260009.

It is an arithmetic number, because the mean of its divisors is an integer number (38864519400).

Almost surely, 2^779128388649 is an apocalyptic number.

It is an amenable number.

779128388649 is a deficient number, since it is larger than the sum of its proper divisors (464536232151).

779128388649 is a wasteful number, since it uses less digits than its factorization.

779128388649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090702 (or 1090696 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 72.

The spelling of 779128388649 in words is "seven hundred seventy-nine billion, one hundred twenty-eight million, three hundred eighty-eight thousand, six hundred forty-nine".