664192 has 16 divisors (see below), whose sum is σ = 1323450. Its totient is φ = 332032.

The previous prime is 664177. The next prime is 664193. The reversal of 664192 is 291466.

It can be written as a sum of positive squares in only one way, i.e., 484416 + 179776 = 696^2 + 424^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 664192.

It is not an unprimeable number, because it can be changed into a prime (664193) by changing a digit.

664192 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2467 + ... + 2722.

2⁶⁶⁴¹⁹² is an apocalyptic number.

It is an amenable number.

664192 is a deficient number, since it is larger than the sum of its proper divisors (659258).

664192 is an equidigital number, since it uses as much as digits as its factorization.

664192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203 (or 5191 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 664192 is about 814.9797543498. The cubic root of 664192 is about 87.2498214297.

It can be divided in two parts, 66 and 4192, that multiplied together give a palindrome (276672).

The spelling of 664192 in words is "six hundred sixty-four thousand, one hundred ninety-two".