8505664 has 28 divisors (see below), whose sum is σ = 16971264. Its totient is φ = 4229504.

The previous prime is 8505649. The next prime is 8505667. The reversal of 8505664 is 4665058.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8505667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22017 + ... + 22399.

Almost surely, 2^8505664 is an apocalyptic number.

It is an amenable number.

8505664 is a deficient number, since it is larger than the sum of its proper divisors (8465600).

8505664 is a wasteful number, since it uses less digits than its factorization.

8505664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 8505664 is about 2916.4471536443. The cubic root of 8505664 is about 204.1280754123.

Subtracting from 8505664 its reverse (4665058), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 8505664 in words is "eight million, five hundred five thousand, six hundred sixty-four".