778188474 has 96 divisors (see below), whose sum is σ = 1998996480. Its totient is φ = 214099200.

The previous prime is 778188373. The next prime is 778188479. The reversal of 778188474 is 474881877.

It is a self number, because there is not a number n which added to its sum of digits gives 778188474.

It is not an unprimeable number, because it can be changed into a prime (778188479) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1097232 + ... + 1097940.

It is an arithmetic number, because the mean of its divisors is an integer number (20822880).

Almost surely, 2^778188474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778188474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999498240).

778188474 is an abundant number, since it is smaller than the sum of its proper divisors (1220808006).

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

778188474 is a wasteful number, since it uses less digits than its factorization.

778188474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036 (or 1033 counting only the distinct ones).

The product of its digits is 2809856, while the sum is 54.

The square root of 778188474 is about 27896.0297175064. The cubic root of 778188474 is about 919.8032321783.

The spelling of 778188474 in words is "seven hundred seventy-eight million, one hundred eighty-eight thousand, four hundred seventy-four".