778648985792 has 112 divisors (see below), whose sum is σ = 1659044870880. Its totient is φ = 361486540800.

The previous prime is 778648985753. The next prime is 778648985797. The reversal of 778648985792 is 297589846877.

It is not an unprimeable number, because it can be changed into a prime (778648985797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20824778 + ... + 20862134.

Almost surely, 2^778648985792 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 778648985792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829522435440).

778648985792 is an abundant number, since it is smaller than the sum of its proper divisors (880395885088).

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

778648985792 is a wasteful number, since it uses less digits than its factorization.

778648985792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37730 (or 37720 counting only the distinct ones).

The product of its digits is 3413975040, while the sum is 80.

The spelling of 778648985792 in words is "seven hundred seventy-eight billion, six hundred forty-eight million, nine hundred eighty-five thousand, seven hundred ninety-two".