8644636 has 96 divisors (see below), whose sum is σ = 21676032. Its totient is φ = 2903040.

The previous prime is 8644633. The next prime is 8644651. The reversal of 8644636 is 6364468.

It is a junction number, because it is equal to n+sod(n) for n = 8644595 and 8644604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68005 + ... + 68131.

It is an arithmetic number, because the mean of its divisors is an integer number (225792).

Almost surely, 2^8644636 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 8644636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10838016).

8644636 is an abundant number, since it is smaller than the sum of its proper divisors (13031396).

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

8644636 is a wasteful number, since it uses less digits than its factorization.

8644636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 177 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 8644636 is about 2940.1761851971. The cubic root of 8644636 is about 205.2338081893.

The spelling of 8644636 in words is "eight million, six hundred forty-four thousand, six hundred thirty-six".