664223232 has 40 divisors (see below), whose sum is σ = 1769536296. Its totient is φ = 221407232.

The previous prime is 664223227. The next prime is 664223237. The reversal of 664223232 is 232322466.

It is an interprime number because it is at equal distance from previous prime (664223227) and next prime (664223237).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 664223232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664223237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214683 + ... + 217754.

Almost surely, 2^664223232 is an apocalyptic number.

It is an amenable number.

664223232 is an abundant number, since it is smaller than the sum of its proper divisors (1105313064).

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

664223232 is an equidigital number, since it uses as much as digits as its factorization.

664223232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432458 (or 432442 counting only the distinct ones).

The product of its digits is 20736, while the sum is 30.

The square root of 664223232 is about 25772.5286303071. The cubic root of 664223232 is about 872.5118897787.

Adding to 664223232 its reverse (232322466), we get a palindrome (896545698).

The spelling of 664223232 in words is "six hundred sixty-four million, two hundred twenty-three thousand, two hundred thirty-two".