664386 has 8 divisors (see below), whose sum is σ = 1328784. Its totient is φ = 221460.

The previous prime is 664381. The next prime is 664403. The reversal of 664386 is 683466.

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

664386 is an admirable number.

It is a super-3 number, since 3×664386³ = 879797395276633368, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (664381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55360 + ... + 55371.

It is an arithmetic number, because the mean of its divisors is an integer number (166098).

2⁶⁶⁴³⁸⁶ is an apocalyptic number.

664386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664386 is a wasteful number, since it uses less digits than its factorization.

664386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110736.

The product of its digits is 20736, while the sum is 33.

The square root of 664386 is about 815.0987670215. The cubic root of 664386 is about 87.2583153680.

The spelling of 664386 in words is "six hundred sixty-four thousand, three hundred eighty-six".