664682 has 8 divisors (see below), whose sum is σ = 1006500. Its totient is φ = 329184.

The previous prime is 664679. The next prime is 664687. The reversal of 664682 is 286466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 654481 + 10201 = 809^2 + 101^2 .

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

It is a super-2 number, since 2×664682² = 883604322248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307 + ... + 1742.

2⁶⁶⁴⁶⁸² is an apocalyptic number.

664682 is a deficient number, since it is larger than the sum of its proper divisors (341818).

664682 is a wasteful number, since it uses less digits than its factorization.

664682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160.

The product of its digits is 13824, while the sum is 32.

The square root of 664682 is about 815.2803198900. The cubic root of 664682 is about 87.2712720059.

The spelling of 664682 in words is "six hundred sixty-four thousand, six hundred eighty-two".