8209664 has 18 divisors (see below), whose sum is σ = 16387770. Its totient is φ = 4104704.

The previous prime is 8209633. The next prime is 8209681. The reversal of 8209664 is 4669028.

It can be written as a sum of positive squares in only one way, i.e., 7840000 + 369664 = 2800^2 + 608^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15779 + ... + 16290.

Almost surely, 2^8209664 is an apocalyptic number.

It is an amenable number.

8209664 is a deficient number, since it is larger than the sum of its proper divisors (8178106).

8209664 is an equidigital number, since it uses as much as digits as its factorization.

8209664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32085 (or 32071 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 8209664 is about 2865.2511233747. The cubic root of 8209664 is about 201.7321548881.

The spelling of 8209664 in words is "eight million, two hundred nine thousand, six hundred sixty-four".