664075 has 12 divisors (see below), whose sum is σ = 834768. Its totient is φ = 524000.

The previous prime is 664067. The next prime is 664091. The reversal of 664075 is 570466.

It is not a de Polignac number, because 664075 - 2³ = 664067 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2394 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (69564).

2⁶⁶⁴⁰⁷⁵ is an apocalyptic number.

664075 is a deficient number, since it is larger than the sum of its proper divisors (170693).

664075 is a wasteful number, since it uses less digits than its factorization.

664075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 664075 is about 814.9079702641. The cubic root of 664075 is about 87.2446979972.

The spelling of 664075 in words is "six hundred sixty-four thousand, seventy-five".