778808860 has 48 divisors (see below), whose sum is σ = 1743436800. Its totient is φ = 291380544.

The previous prime is 778808857. The next prime is 778808861. The reversal of 778808860 is 68808877.

It is a junction number, because it is equal to n+sod(n) for n = 778808798 and 778808807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778808861) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17049 + ... + 42991.

It is an arithmetic number, because the mean of its divisors is an integer number (36321600).

Almost surely, 2^778808860 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 778808860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871718400).

778808860 is an abundant number, since it is smaller than the sum of its proper divisors (964627940).

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

778808860 is a wasteful number, since it uses less digits than its factorization.

778808860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26050 (or 26048 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 52.

The square root of 778808860 is about 27907.1471132396. The cubic root of 778808860 is about 920.0475952062.

The spelling of 778808860 in words is "seven hundred seventy-eight million, eight hundred eight thousand, eight hundred sixty".