779448647 has 4 divisors (see below), whose sum is σ = 820472280. Its totient is φ = 738425016.

The previous prime is 779448643. The next prime is 779448671. The reversal of 779448647 is 746844977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746844977 = 347 ⋅2152291.

It is a cyclic number.

It is not a de Polignac number, because 779448647 - 2² = 779448643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 779448592 and 779448601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779448643) 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, 20511788 + ... + 20511825.

It is an arithmetic number, because the mean of its divisors is an integer number (205118070).

Almost surely, 2^779448647 is an apocalyptic number.

779448647 is a deficient number, since it is larger than the sum of its proper divisors (41023633).

779448647 is a wasteful number, since it uses less digits than its factorization.

779448647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41023632.

The product of its digits is 9483264, while the sum is 56.

The square root of 779448647 is about 27918.6075404917. The cubic root of 779448647 is about 920.2994641854.

The spelling of 779448647 in words is "seven hundred seventy-nine million, four hundred forty-eight thousand, six hundred forty-seven".