780979664 has 10 divisors (see below), whose sum is σ = 1513148130. Its totient is φ = 390489824.

The previous prime is 780979649. The next prime is 780979669. The reversal of 780979664 is 466979087.

780979664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 740275264 + 40704400 = 27208^2 + 6380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780979669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24405599 + ... + 24405630.

It is an arithmetic number, because the mean of its divisors is an integer number (151314813).

Almost surely, 2^780979664 is an apocalyptic number.

It is an amenable number.

780979664 is a deficient number, since it is larger than the sum of its proper divisors (732168466).

780979664 is a wasteful number, since it uses less digits than its factorization.

780979664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48811237 (or 48811231 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 56.

The square root of 780979664 is about 27946.0133829496. The cubic root of 780979664 is about 920.9016302617.

The spelling of 780979664 in words is "seven hundred eighty million, nine hundred seventy-nine thousand, six hundred sixty-four".