664475 has 12 divisors (see below), whose sum is σ = 941904. Its totient is φ = 455520.

The previous prime is 664471. The next prime is 664507. The reversal of 664475 is 574466.

664475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664475 - 2² = 664471 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664475.

It is not an unprimeable number, because it can be changed into a prime (664471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1724 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (78492).

2⁶⁶⁴⁴⁷⁵ is an apocalyptic number.

664475 is a deficient number, since it is larger than the sum of its proper divisors (277429).

664475 is a wasteful number, since it uses less digits than its factorization.

664475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814 (or 3809 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 664475 is about 815.1533598042. The cubic root of 664475 is about 87.2622115184.

Subtracting from 664475 its reverse (574466), we obtain a palindrome (90009).

The spelling of 664475 in words is "six hundred sixty-four thousand, four hundred seventy-five".