664495 has 8 divisors (see below), whose sum is σ = 858816. Its totient is φ = 490656.

The previous prime is 664471. The next prime is 664507. The reversal of 664495 is 594466.

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

It is a cyclic number.

It is not a de Polignac number, because 664495 - 2⁹ = 663983 is a prime.

It is a super-4 number, since 4×664495⁴ (a number of 24 digits) contains 4444 as substring.

It is a Duffinian number.

664495 is a lucky number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 664495.

It is a congruent number.

It is an unprimeable number.

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, 5047 + ... + 5176.

It is an arithmetic number, because the mean of its divisors is an integer number (107352).

2⁶⁶⁴⁴⁹⁵ is an apocalyptic number.

664495 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664495 is a deficient number, since it is larger than the sum of its proper divisors (194321).

664495 is a wasteful number, since it uses less digits than its factorization.

664495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10241.

The product of its digits is 25920, while the sum is 34.

The square root of 664495 is about 815.1656273421. The cubic root of 664495 is about 87.2630870099.

The spelling of 664495 in words is "six hundred sixty-four thousand, four hundred ninety-five".