878487257865 has 24 divisors (see below), whose sum is σ = 1635061999680. Its totient is φ = 401594174688.

The previous prime is 878487257863. The next prime is 878487257897. The reversal of 878487257865 is 568752784878.

It is not a de Polignac number, because 878487257865 - 2¹ = 878487257863 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (878487257861) 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, 597609645 + ... + 597611114.

It is an arithmetic number, because the mean of its divisors is an integer number (68127583320).

Almost surely, 2^878487257865 is an apocalyptic number.

It is an amenable number.

878487257865 is a deficient number, since it is larger than the sum of its proper divisors (756574741815).

878487257865 is a wasteful number, since it uses less digits than its factorization.

878487257865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195220781 (or 1195220774 counting only the distinct ones).

The product of its digits is 1685913600, while the sum is 75.

The spelling of 878487257865 in words is "eight hundred seventy-eight billion, four hundred eighty-seven million, two hundred fifty-seven thousand, eight hundred sixty-five".