778438956 has 48 divisors (see below), whose sum is σ = 1941585408. Its totient is φ = 242140800.

The previous prime is 778438943. The next prime is 778438961. The reversal of 778438956 is 659834877.

It is a junction number, because it is equal to n+sod(n) for n = 778438896 and 778438905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23080 + ... + 45711.

It is an arithmetic number, because the mean of its divisors is an integer number (40449696).

Almost surely, 2^778438956 is an apocalyptic number.

It is an amenable number.

778438956 is an abundant number, since it is smaller than the sum of its proper divisors (1163146452).

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

778438956 is a wasteful number, since it uses less digits than its factorization.

778438956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68862 (or 68860 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 57.

The square root of 778438956 is about 27900.5189199054. The cubic root of 778438956 is about 919.9019098319.

The spelling of 778438956 in words is "seven hundred seventy-eight million, four hundred thirty-eight thousand, nine hundred fifty-six".