664285 has 4 divisors (see below), whose sum is σ = 797148. Its totient is φ = 531424.

The previous prime is 664273. The next prime is 664289. The reversal of 664285 is 582466.

664285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 502681 + 161604 = 709^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 664285 - 2⁵ = 664253 is a prime.

It is a super-2 number, since 2×664285² = 882549122450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

664285 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66424 + ... + 66433.

It is an arithmetic number, because the mean of its divisors is an integer number (199287).

2⁶⁶⁴²⁸⁵ is an apocalyptic number.

It is an amenable number.

664285 is a deficient number, since it is larger than the sum of its proper divisors (132863).

664285 is a wasteful number, since it uses less digits than its factorization.

664285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132862.

The product of its digits is 11520, while the sum is 31.

The square root of 664285 is about 815.0368089847. The cubic root of 664285 is about 87.2538934724.

It can be divided in two parts, 664 and 285, that added together give a palindrome (949).

The spelling of 664285 in words is "six hundred sixty-four thousand, two hundred eighty-five".