778381917960 has 128 divisors (see below), whose sum is σ = 2356299694080. Its totient is φ = 205692012288.

The previous prime is 778381917953. The next prime is 778381918003. The reversal of 778381917960 is 69719183877.

It is a junction number, because it is equal to n+sod(n) for n = 778381917891 and 778381917900.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13122529 + ... + 13181711.

It is an arithmetic number, because the mean of its divisors is an integer number (18408591360).

Almost surely, 2^778381917960 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 778381917960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178149847040).

778381917960 is an abundant number, since it is smaller than the sum of its proper divisors (1577917776120).

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

778381917960 is a wasteful number, since it uses less digits than its factorization.

778381917960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60187 (or 60183 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 66.

The spelling of 778381917960 in words is "seven hundred seventy-eight billion, three hundred eighty-one million, nine hundred seventeen thousand, nine hundred sixty".