8864639 has 12 divisors (see below), whose sum is σ = 10398168. Its totient is φ = 7534800.

The previous prime is 8864587. The next prime is 8864641. The reversal of 8864639 is 9364688.

It is a de Polignac number, because none of the positive numbers 2^k-8864639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8864639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8864239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5729 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (866514).

Almost surely, 2^8864639 is an apocalyptic number.

8864639 is a deficient number, since it is larger than the sum of its proper divisors (1533529).

8864639 is a wasteful number, since it uses less digits than its factorization.

8864639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526 (or 1519 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 8864639 is about 2977.3543625172. The cubic root of 8864639 is about 206.9602870598.

The spelling of 8864639 in words is "eight million, eight hundred sixty-four thousand, six hundred thirty-nine".