861004878 has 8 divisors (see below), whose sum is σ = 1722009768. Its totient is φ = 287001624.

The previous prime is 861004847. The next prime is 861004919. The reversal of 861004878 is 878400168.

861004878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

861004878 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71750401 + ... + 71750412.

It is an arithmetic number, because the mean of its divisors is an integer number (215251221).

Almost surely, 2^861004878 is an apocalyptic number.

861004878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

861004878 is a wasteful number, since it uses less digits than its factorization.

861004878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143500818.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 861004878 is about 29342.8846230223. The cubic root of 861004878 is about 951.3387875888.

The spelling of 861004878 in words is "eight hundred sixty-one million, four thousand, eight hundred seventy-eight".