664726 has 8 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 326040.

The previous prime is 664711. The next prime is 664739. The reversal of 664726 is 627466.

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

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, 3030 + ... + 3241.

It is an arithmetic number, because the mean of its divisors is an integer number (127008).

2⁶⁶⁴⁷²⁶ is an apocalyptic number.

664726 is a deficient number, since it is larger than the sum of its proper divisors (351338).

664726 is a wasteful number, since it uses less digits than its factorization.

664726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6326.

The product of its digits is 12096, while the sum is 31.

The square root of 664726 is about 815.3073040271. The cubic root of 664726 is about 87.2731976642.

The spelling of 664726 in words is "six hundred sixty-four thousand, seven hundred twenty-six".