664875 has 32 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 352800.

The previous prime is 664849. The next prime is 664879. The reversal of 664875 is 578466.

It is a happy number.

664875 is a `hidden beast` number, since 6 + 648 + 7 + 5 = 666.

664875 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 664875 - 2⁵ = 664843 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (664879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3277 + ... + 3473.

It is an arithmetic number, because the mean of its divisors is an integer number (38610).

2⁶⁶⁴⁸⁷⁵ is an apocalyptic number.

664875 is a deficient number, since it is larger than the sum of its proper divisors (570645).

664875 is a wasteful number, since it uses less digits than its factorization.

664875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 205 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 664875 is about 815.3986754956. The cubic root of 664875 is about 87.2797180125.

The spelling of 664875 in words is "six hundred sixty-four thousand, eight hundred seventy-five".