779557049 has 4 divisors (see below), whose sum is σ = 825413364. Its totient is φ = 733700736.

The previous prime is 779557039. The next prime is 779557063. The reversal of 779557049 is 940755977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 634788025 + 144769024 = 25195^2 + 12032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-779557049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779557039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22928132 + ... + 22928165.

It is an arithmetic number, because the mean of its divisors is an integer number (206353341).

Almost surely, 2^779557049 is an apocalyptic number.

It is an amenable number.

779557049 is a deficient number, since it is larger than the sum of its proper divisors (45856315).

779557049 is a wasteful number, since it uses less digits than its factorization.

779557049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45856314.

The product of its (nonzero) digits is 2778300, while the sum is 53.

The square root of 779557049 is about 27920.5488663815. The cubic root of 779557049 is about 920.3421258277.

The spelling of 779557049 in words is "seven hundred seventy-nine million, five hundred fifty-seven thousand, forty-nine".