778676823 has 12 divisors (see below), whose sum is σ = 1190917728. Its totient is φ = 488581440.

The previous prime is 778676783. The next prime is 778676837. The reversal of 778676823 is 328676877.

It is not a de Polignac number, because 778676823 - 2⁸ = 778676567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 778676823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778676893) 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 11 ways as a sum of consecutive naturals, for example, 2544543 + ... + 2544848.

It is an arithmetic number, because the mean of its divisors is an integer number (99243144).

Almost surely, 2^778676823 is an apocalyptic number.

778676823 is a deficient number, since it is larger than the sum of its proper divisors (412240905).

778676823 is a wasteful number, since it uses less digits than its factorization.

778676823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089414 (or 5089411 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 778676823 is about 27904.7813644902. The cubic root of 778676823 is about 919.9955981989.

Adding to 778676823 its sum of digits (54), we get a palindrome (778676877).

The spelling of 778676823 in words is "seven hundred seventy-eight million, six hundred seventy-six thousand, eight hundred twenty-three".