872816865 has 16 divisors (see below), whose sum is σ = 1434251328. Its totient is φ = 452920896.

The previous prime is 872816863. The next prime is 872816909. The reversal of 872816865 is 568618278.

It is not a de Polignac number, because 872816865 - 2¹ = 872816863 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (872816863) 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, 785767 + ... + 786876.

It is an arithmetic number, because the mean of its divisors is an integer number (89640708).

Almost surely, 2^872816865 is an apocalyptic number.

It is an amenable number.

872816865 is a deficient number, since it is larger than the sum of its proper divisors (561434463).

872816865 is a wasteful number, since it uses less digits than its factorization.

872816865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572688.

The product of its digits is 1290240, while the sum is 51.

The square root of 872816865 is about 29543.4741525096. The cubic root of 872816865 is about 955.6694647097.

The spelling of 872816865 in words is "eight hundred seventy-two million, eight hundred sixteen thousand, eight hundred sixty-five".