9865775688 has 64 divisors (see below), whose sum is σ = 26106225600. Its totient is φ = 3098269440.

The previous prime is 9865775681. The next prime is 9865775693. The reversal of 9865775688 is 8865775689.

It is not an unprimeable number, because it can be changed into a prime (9865775681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22770 + ... + 142302.

It is an arithmetic number, because the mean of its divisors is an integer number (407909775).

Almost surely, 2^9865775688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9865775688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13053112800).

9865775688 is an abundant number, since it is smaller than the sum of its proper divisors (16240449912).

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

9865775688 is a wasteful number, since it uses less digits than its factorization.

9865775688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119742 (or 119738 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 69.

The square root of 9865775688 is about 99326.6111774684. The cubic root of 9865775688 is about 2144.7519876692.

Subtracting from 9865775688 its reverse (8865775689), we obtain a palindrome (999999999).

It can be divided in two parts, 98657 and 75688, that added together give a triangular number (174345 = T₅₉₀).

The spelling of 9865775688 in words is "nine billion, eight hundred sixty-five million, seven hundred seventy-five thousand, six hundred eighty-eight".