664766 has 8 divisors (see below), whose sum is σ = 1000920. Its totient is φ = 331128.

The previous prime is 664757. The next prime is 664771. The reversal of 664766 is 667466.

664766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (125115).

2⁶⁶⁴⁷⁶⁶ is an apocalyptic number.

664766 is a deficient number, since it is larger than the sum of its proper divisors (336154).

664766 is a wasteful number, since it uses less digits than its factorization.

664766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its digits is 36288, while the sum is 35.

The square root of 664766 is about 815.3318342859. The cubic root of 664766 is about 87.2749481890.

The spelling of 664766 in words is "six hundred sixty-four thousand, seven hundred sixty-six".