664502 has 4 divisors (see below), whose sum is σ = 996756. Its totient is φ = 332250.

The previous prime is 664471. The next prime is 664507. The reversal of 664502 is 205466.

664502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664502.

It is not an unprimeable number, because it can be changed into a prime (664507) by changing a digit.

664502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166124 + ... + 166127.

It is an arithmetic number, because the mean of its divisors is an integer number (249189).

2⁶⁶⁴⁵⁰² is an apocalyptic number.

664502 is a deficient number, since it is larger than the sum of its proper divisors (332254).

664502 is a wasteful number, since it uses less digits than its factorization.

664502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332253.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 664502 is about 815.1699209367. The cubic root of 664502 is about 87.2633934278.

Adding to 664502 its reverse (205466), we get a palindrome (869968).

The spelling of 664502 in words is "six hundred sixty-four thousand, five hundred two".