779648965 has 4 divisors (see below), whose sum is σ = 935578764. Its totient is φ = 623719168.

The previous prime is 779648897. The next prime is 779649007. The reversal of 779648965 is 569846977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569846977 = 7 ⋅81406711.

It can be written as a sum of positive squares in 2 ways, for example, as 620308836 + 159340129 = 24906^2 + 12623^2 .

It is a cyclic number.

It is not a de Polignac number, because 779648965 - 2¹³ = 779640773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77964892 + ... + 77964901.

It is an arithmetic number, because the mean of its divisors is an integer number (233894691).

Almost surely, 2^779648965 is an apocalyptic number.

It is an amenable number.

779648965 is a deficient number, since it is larger than the sum of its proper divisors (155929799).

779648965 is a wasteful number, since it uses less digits than its factorization.

779648965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155929798.

The product of its digits is 22861440, while the sum is 61.

The square root of 779648965 is about 27922.1948456779. The cubic root of 779648965 is about 920.3782963010.

The spelling of 779648965 in words is "seven hundred seventy-nine million, six hundred forty-eight thousand, nine hundred sixty-five".