778113520 has 20 divisors (see below), whose sum is σ = 1809114120. Its totient is φ = 311245376.

The previous prime is 778113467. The next prime is 778113527. The reversal of 778113520 is 25311877.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778113527) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4863130 + ... + 4863289.

It is an arithmetic number, because the mean of its divisors is an integer number (90455706).

Almost surely, 2^778113520 is an apocalyptic number.

It is an amenable number.

778113520 is an abundant number, since it is smaller than the sum of its proper divisors (1031000600).

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

778113520 is a wasteful number, since it uses less digits than its factorization.

778113520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9726432 (or 9726426 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 778113520 is about 27894.6862323275. The cubic root of 778113520 is about 919.7736998532.

The spelling of 778113520 in words is "seven hundred seventy-eight million, one hundred thirteen thousand, five hundred twenty".