664208 has 10 divisors (see below), whose sum is σ = 1286934. Its totient is φ = 332096.

The previous prime is 664199. The next prime is 664211. The reversal of 664208 is 802466.

It can be written as a sum of positive squares in only one way, i.e., 620944 + 43264 = 788^2 + 208^2 .

It is an unprimeable number.

664208 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20741 + ... + 20772.

2⁶⁶⁴²⁰⁸ is an apocalyptic number.

It is an amenable number.

664208 is a deficient number, since it is larger than the sum of its proper divisors (622726).

664208 is a wasteful number, since it uses less digits than its factorization.

664208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41521 (or 41515 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 664208 is about 814.9895704854. The cubic root of 664208 is about 87.2505220232.

The spelling of 664208 in words is "six hundred sixty-four thousand, two hundred eight".