856887689 has 8 divisors (see below), whose sum is σ = 981044160. Its totient is φ = 733167216.

The previous prime is 856887683. The next prime is 856887697. The reversal of 856887689 is 986788658.

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

It is a cyclic number.

It is not a de Polignac number, because 856887689 - 2⁴ = 856887673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856887683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104774 + ... + 112655.

It is an arithmetic number, because the mean of its divisors is an integer number (122630520).

Almost surely, 2^856887689 is an apocalyptic number.

It is an amenable number.

856887689 is a deficient number, since it is larger than the sum of its proper divisors (124156471).

856887689 is a wasteful number, since it uses less digits than its factorization.

856887689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217999.

The product of its digits is 46448640, while the sum is 65.

The square root of 856887689 is about 29272.6440384192. The cubic root of 856887689 is about 949.8199802939.

The spelling of 856887689 in words is "eight hundred fifty-six million, eight hundred eighty-seven thousand, six hundred eighty-nine".