864187878 has 32 divisors (see below), whose sum is σ = 1865721600. Its totient is φ = 266035616.

The previous prime is 864187871. The next prime is 864187879. The reversal of 864187878 is 878781468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864187871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103968 + ... + 111971.

It is an arithmetic number, because the mean of its divisors is an integer number (58303800).

Almost surely, 2^864187878 is an apocalyptic number.

864187878 is an abundant number, since it is smaller than the sum of its proper divisors (1001533722).

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

864187878 is a wasteful number, since it uses less digits than its factorization.

864187878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215996.

The product of its digits is 4816896, while the sum is 57.

The square root of 864187878 is about 29397.0726093603. The cubic root of 864187878 is about 952.5096626902.

The spelling of 864187878 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred seventy-eight".