778284734766 has 288 divisors, whose sum is σ = 2071029252096. Its totient is φ = 194055523200.

The previous prime is 778284734749. The next prime is 778284734771. The reversal of 778284734766 is 667437482877.

778284734766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 778284734766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 140052060 + ... + 140057616.

It is an arithmetic number, because the mean of its divisors is an integer number (7191073792).

Almost surely, 2^778284734766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778284734766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035514626048).

778284734766 is an abundant number, since it is smaller than the sum of its proper divisors (1292744517330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778284734766 is a wasteful number, since it uses less digits than its factorization.

778284734766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5756 (or 5738 counting only the distinct ones).

The product of its digits is 531062784, while the sum is 69.

The spelling of 778284734766 in words is "seven hundred seventy-eight billion, two hundred eighty-four million, seven hundred thirty-four thousand, seven hundred sixty-six".