778426864820 has 48 divisors (see below), whose sum is σ = 1783860454656. Its totient is φ = 282976176000.

The previous prime is 778426864819. The next prime is 778426864841. The reversal of 778426864820 is 28468624877.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159365 + ... + 1257875.

It is an arithmetic number, because the mean of its divisors is an integer number (37163759472).

Almost surely, 2^778426864820 is an apocalyptic number.

It is an amenable number.

778426864820 is an abundant number, since it is smaller than the sum of its proper divisors (1005433589836).

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

778426864820 is a wasteful number, since it uses less digits than its factorization.

778426864820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101752 (or 1101750 counting only the distinct ones).

The product of its (nonzero) digits is 57802752, while the sum is 62.

The spelling of 778426864820 in words is "seven hundred seventy-eight billion, four hundred twenty-six million, eight hundred sixty-four thousand, eight hundred twenty".