779947617 has 4 divisors (see below), whose sum is σ = 1039930160. Its totient is φ = 519965076.

The previous prime is 779947613. The next prime is 779947639. The reversal of 779947617 is 716749977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 779947617 - 2² = 779947613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779947613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129991267 + ... + 129991272.

It is an arithmetic number, because the mean of its divisors is an integer number (259982540).

Almost surely, 2^779947617 is an apocalyptic number.

It is an amenable number.

779947617 is a deficient number, since it is larger than the sum of its proper divisors (259982543).

779947617 is a wasteful number, since it uses less digits than its factorization.

779947617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259982542.

The product of its digits is 4667544, while the sum is 57.

The square root of 779947617 is about 27927.5422656560. The cubic root of 779947617 is about 920.4958012044.

The spelling of 779947617 in words is "seven hundred seventy-nine million, nine hundred forty-seven thousand, six hundred seventeen".