8639664 has 40 divisors (see below), whose sum is σ = 24349632. Its totient is φ = 2617920.

The previous prime is 8639663. The next prime is 8639711. The reversal of 8639664 is 4669368.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8639663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7654 + ... + 8709.

Almost surely, 2^8639664 is an apocalyptic number.

It is an amenable number.

8639664 is an abundant number, since it is smaller than the sum of its proper divisors (15709968).

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

8639664 is a wasteful number, since it uses less digits than its factorization.

8639664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16385 (or 16379 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 8639664 is about 2939.3305360235. The cubic root of 8639664 is about 205.1944536041.

Adding to 8639664 its product of digits (186624), we get a palindrome (8826288).

The spelling of 8639664 in words is "eight million, six hundred thirty-nine thousand, six hundred sixty-four".