778741560872 has 64 divisors (see below), whose sum is σ = 1644993999360. Its totient is φ = 342402796800.

The previous prime is 778741560799. The next prime is 778741560901. The reversal of 778741560872 is 278065147877.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6193058 + ... + 6317550.

It is an arithmetic number, because the mean of its divisors is an integer number (25703031240).

Almost surely, 2^778741560872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778741560872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822496999680).

778741560872 is an abundant number, since it is smaller than the sum of its proper divisors (866252438488).

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

778741560872 is a wasteful number, since it uses less digits than its factorization.

778741560872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126834 (or 126830 counting only the distinct ones).

The product of its (nonzero) digits is 36879360, while the sum is 62.

The spelling of 778741560872 in words is "seven hundred seventy-eight billion, seven hundred forty-one million, five hundred sixty thousand, eight hundred seventy-two".