664375 has 10 divisors (see below), whose sum is σ = 830984. Its totient is φ = 531000.

The previous prime is 664369. The next prime is 664379. The reversal of 664375 is 573466.

664375 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 664375 - 2¹¹ = 662327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664379) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 94 + ... + 1156.

2⁶⁶⁴³⁷⁵ is an apocalyptic number.

664375 is a deficient number, since it is larger than the sum of its proper divisors (166609).

664375 is an equidigital number, since it uses as much as digits as its factorization.

664375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1068 counting only the distinct ones).

The product of its digits is 15120, while the sum is 31.

The square root of 664375 is about 815.0920193451. The cubic root of 664375 is about 87.2578337972.

Subtracting from 664375 its reverse (573466), we obtain a palindrome (90909).

The spelling of 664375 in words is "six hundred sixty-four thousand, three hundred seventy-five".