778942764 has 96 divisors (see below), whose sum is σ = 2117364480. Its totient is φ = 247363200.

The previous prime is 778942757. The next prime is 778942823. The reversal of 778942764 is 467249877.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 778942764.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188359 + ... + 192449.

It is an arithmetic number, because the mean of its divisors is an integer number (22055880).

Almost surely, 2^778942764 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 778942764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058682240).

778942764 is an abundant number, since it is smaller than the sum of its proper divisors (1338421716).

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

778942764 is a wasteful number, since it uses less digits than its factorization.

778942764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4188 (or 4180 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 778942764 is about 27909.5461088137. The cubic root of 778942764 is about 920.1003214482.

The spelling of 778942764 in words is "seven hundred seventy-eight million, nine hundred forty-two thousand, seven hundred sixty-four".