778209264 has 120 divisors (see below), whose sum is σ = 2509045760. Its totient is φ = 220558464.

The previous prime is 778209251. The next prime is 778209293. The reversal of 778209264 is 462902877.

778209264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124977 + ... + 131055.

Almost surely, 2^778209264 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 778209264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254522880).

778209264 is an abundant number, since it is smaller than the sum of its proper divisors (1730836496).

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

778209264 is a wasteful number, since it uses less digits than its factorization.

778209264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227 (or 6218 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 778209264 is about 27896.4023486901. The cubic root of 778209264 is about 919.8114232269.

The spelling of 778209264 in words is "seven hundred seventy-eight million, two hundred nine thousand, two hundred sixty-four".