664287 has 8 divisors (see below), whose sum is σ = 953904. Its totient is φ = 408768.

The previous prime is 664273. The next prime is 664289. The reversal of 664287 is 782466.

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

It is not a de Polignac number, because 664287 - 2⁴ = 664271 is a prime.

664287 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8478 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (119238).

2⁶⁶⁴²⁸⁷ is an apocalyptic number.

664287 is a deficient number, since it is larger than the sum of its proper divisors (289617).

664287 is a wasteful number, since it uses less digits than its factorization.

664287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17049.

The product of its digits is 16128, while the sum is 33.

The square root of 664287 is about 815.0380359223. The cubic root of 664287 is about 87.2539810391.

The spelling of 664287 in words is "six hundred sixty-four thousand, two hundred eighty-seven".