664258 has 16 divisors (see below), whose sum is σ = 1206144. Its totient is φ = 267840.

The previous prime is 664253. The next prime is 664271. The reversal of 664258 is 852466.

It is not an unprimeable number, because it can be changed into a prime (664253) by changing a digit.

664258 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 1158 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (75384).

2⁶⁶⁴²⁵⁸ is an apocalyptic number.

664258 is a deficient number, since it is larger than the sum of its proper divisors (541886).

664258 is a wasteful number, since it uses less digits than its factorization.

664258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817.

The product of its digits is 11520, while the sum is 31.

The square root of 664258 is about 815.0202451473. The cubic root of 664258 is about 87.2527113056.

The spelling of 664258 in words is "six hundred sixty-four thousand, two hundred fifty-eight".