868935636 has 72 divisors (see below), whose sum is σ = 2247565320. Its totient is φ = 282956544.

The previous prime is 868935619. The next prime is 868935643. The reversal of 868935636 is 636539868.

It can be written as a sum of positive squares in 4 ways, for example, as 29095236 + 839840400 = 5394^2 + 28980^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 512406 + ... + 514098.

It is an arithmetic number, because the mean of its divisors is an integer number (31216185).

Almost surely, 2^868935636 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 868935636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123782660).

868935636 is an abundant number, since it is smaller than the sum of its proper divisors (1378629684).

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

868935636 is a wasteful number, since it uses less digits than its factorization.

868935636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025 (or 2020 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 868935636 is about 29477.7142261743. The cubic root of 868935636 is about 954.2508075717.

It can be divided in two parts, 86893 and 5636, that added together give a palindrome (92529).

The spelling of 868935636 in words is "eight hundred sixty-eight million, nine hundred thirty-five thousand, six hundred thirty-six".