664368 has 20 divisors (see below), whose sum is σ = 1716408. Its totient is φ = 221440.

The previous prime is 664357. The next prime is 664369. The reversal of 664368 is 863466.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (664369) 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, 6873 + ... + 6968.

2⁶⁶⁴³⁶⁸ is an apocalyptic number.

It is an amenable number.

664368 is an abundant number, since it is smaller than the sum of its proper divisors (1052040).

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

664368 is a wasteful number, since it uses less digits than its factorization.

664368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13852 (or 13846 counting only the distinct ones).

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

The square root of 664368 is about 815.0877253400. The cubic root of 664368 is about 87.2575273402.

The spelling of 664368 in words is "six hundred sixty-four thousand, three hundred sixty-eight".