78804585819 has 24 divisors (see below), whose sum is σ = 117854146800. Its totient is φ = 50681641920.

The previous prime is 78804585787. The next prime is 78804585863. The reversal of 78804585819 is 91858540887.

78804585819 is a `hidden beast` number, since 7 + 8 + 8 + 0 + 45 + 8 + 581 + 9 = 666.

It is not a de Polignac number, because 78804585819 - 2⁵ = 78804585787 is a prime.

It is a super-2 number, since 2×78804585819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78804585869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180412 + ... + 436070.

It is an arithmetic number, because the mean of its divisors is an integer number (4910589450).

Almost surely, 2^78804585819 is an apocalyptic number.

78804585819 is a deficient number, since it is larger than the sum of its proper divisors (39049560981).

78804585819 is a wasteful number, since it uses less digits than its factorization.

78804585819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256875 (or 256872 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 63.

The spelling of 78804585819 in words is "seventy-eight billion, eight hundred four million, five hundred eighty-five thousand, eight hundred nineteen".