664530 has 32 divisors (see below), whose sum is σ = 1689984. Its totient is φ = 166656.

The previous prime is 664529. The next prime is 664537. The reversal of 664530 is 35466.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664530.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (52812).

2⁶⁶⁴⁵³⁰ is an apocalyptic number.

664530 is an abundant number, since it is smaller than the sum of its proper divisors (1025454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664530 is a wasteful number, since it uses less digits than its factorization.

664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 664530 is about 815.1870950892. The cubic root of 664530 is about 87.2646190778.

Adding to 664530 its reverse (35466), we get a palindrome (699996).

The spelling of 664530 in words is "six hundred sixty-four thousand, five hundred thirty".