870023891 has 4 divisors (see below), whose sum is σ = 949116984. Its totient is φ = 790930800.

The previous prime is 870023881. The next prime is 870023893. The reversal of 870023891 is 198320078.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 870023891 - 2¹⁴ = 870007507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870023893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39546530 + ... + 39546551.

It is an arithmetic number, because the mean of its divisors is an integer number (237279246).

Almost surely, 2^870023891 is an apocalyptic number.

870023891 is a deficient number, since it is larger than the sum of its proper divisors (79093093).

870023891 is a wasteful number, since it uses less digits than its factorization.

870023891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79093092.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 870023891 is about 29496.1673951041. The cubic root of 870023891 is about 954.6490092892.

The spelling of 870023891 in words is "eight hundred seventy million, twenty-three thousand, eight hundred ninety-one".