664706 has 16 divisors (see below), whose sum is σ = 1155840. Its totient is φ = 280800.

The previous prime is 664693. The next prime is 664711. The reversal of 664706 is 607466.

It is an unprimeable number.

664706 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 in 7 ways as a sum of consecutive naturals, for example, 806 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (72240).

2⁶⁶⁴⁷⁰⁶ is an apocalyptic number.

664706 is a deficient number, since it is larger than the sum of its proper divisors (491134).

664706 is a wasteful number, since it uses less digits than its factorization.

664706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 664706 is about 815.2950386210. The cubic root of 664706 is about 87.2723223755.

The spelling of 664706 in words is "six hundred sixty-four thousand, seven hundred six".