864857089 has 4 divisors (see below), whose sum is σ = 868569156. Its totient is φ = 861145024.

The previous prime is 864857083. The next prime is 864857093. The reversal of 864857089 is 980758468.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84492864 + 780364225 = 9192^2 + 27935^2 .

It is a cyclic number.

It is not a de Polignac number, because 864857089 - 2⁷ = 864856961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864857083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855684 + ... + 1856149.

It is an arithmetic number, because the mean of its divisors is an integer number (217142289).

Almost surely, 2^864857089 is an apocalyptic number.

It is an amenable number.

864857089 is a deficient number, since it is larger than the sum of its proper divisors (3712067).

864857089 is a wasteful number, since it uses less digits than its factorization.

864857089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712066.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The square root of 864857089 is about 29408.4526794594. The cubic root of 864857089 is about 952.7554678339.

The spelling of 864857089 in words is "eight hundred sixty-four million, eight hundred fifty-seven thousand, eighty-nine".