78689505800 has 48 divisors (see below), whose sum is σ = 187897797060. Its totient is φ = 30625102080.

The previous prime is 78689505779. The next prime is 78689505823. The reversal of 78689505800 is 850598687.

It can be written as a sum of positive squares in 6 ways, for example, as 50424498916 + 28265006884 = 224554^2 + 168122^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5309459 + ... + 5324258.

Almost surely, 2^78689505800 is an apocalyptic number.

It is an amenable number.

78689505800 is an abundant number, since it is smaller than the sum of its proper divisors (109208291260).

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

78689505800 is a wasteful number, since it uses less digits than its factorization.

78689505800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633770 (or 10633761 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 78689505800 in words is "seventy-eight billion, six hundred eighty-nine million, five hundred five thousand, eight hundred".