50778738864 has 80 divisors (see below), whose sum is σ = 166575767040. Its totient is φ = 14508210240.

The previous prime is 50778738859. The next prime is 50778738877. The reversal of 50778738864 is 46883787705.

50778738864 is a `hidden beast` number, since 50 + 77 + 87 + 388 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8392932 + ... + 8398979.

It is an arithmetic number, because the mean of its divisors is an integer number (2082197088).

Almost surely, 2^50778738864 is an apocalyptic number.

50778738864 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

50778738864 is an abundant number, since it is smaller than the sum of its proper divisors (115797028176).

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

50778738864 is a wasteful number, since it uses less digits than its factorization.

50778738864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16791935 (or 16791923 counting only the distinct ones).

The product of its (nonzero) digits is 63221760, while the sum is 63.

The spelling of 50778738864 in words is "fifty billion, seven hundred seventy-eight million, seven hundred thirty-eight thousand, eight hundred sixty-four".