780774664 has 16 divisors (see below), whose sum is σ = 1475481600. Its totient is φ = 387312912.

The previous prime is 780774647. The next prime is 780774677. The reversal of 780774664 is 466477087.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383224 + ... + 385255.

It is an arithmetic number, because the mean of its divisors is an integer number (92217600).

Almost surely, 2^780774664 is an apocalyptic number.

It is an amenable number.

780774664 is a deficient number, since it is larger than the sum of its proper divisors (694706936).

780774664 is a wasteful number, since it uses less digits than its factorization.

780774664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768612 (or 768608 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 49.

The square root of 780774664 is about 27942.3453561078. The cubic root of 780774664 is about 920.8210471329.

The spelling of 780774664 in words is "seven hundred eighty million, seven hundred seventy-four thousand, six hundred sixty-four".