778041992 has 128 divisors (see below), whose sum is σ = 1941408000. Its totient is φ = 289465344.

The previous prime is 778041991. The next prime is 778042021. The reversal of 778041992 is 299140877.

It is not an unprimeable number, because it can be changed into a prime (778041991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 605783 + ... + 607065.

It is an arithmetic number, because the mean of its divisors is an integer number (15167250).

Almost surely, 2^778041992 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 778041992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970704000).

778041992 is an abundant number, since it is smaller than the sum of its proper divisors (1163366008).

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

778041992 is a wasteful number, since it uses less digits than its factorization.

778041992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 778041992 is about 27893.4040948752. The cubic root of 778041992 is about 919.7455156240.

The spelling of 778041992 in words is "seven hundred seventy-eight million, forty-one thousand, nine hundred ninety-two".