664031232 has 78 divisors (see below), whose sum is σ = 1918184762. Its totient is φ = 221331456.

The previous prime is 664031227. The next prime is 664031233. The reversal of 664031232 is 232130466.

664031232 is a `hidden beast` number, since 6 + 640 + 3 + 12 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 652087296 + 11943936 = 25536^2 + 3456^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664031196 and 664031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664031233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27858 + ... + 45870.

Almost surely, 2^664031232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959092381).

664031232 is an abundant number, since it is smaller than the sum of its proper divisors (1254153530).

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

664031232 is a wasteful number, since it uses less digits than its factorization.

664031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18043 (or 18018 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 664031232 is about 25768.8034646547. The cubic root of 664031232 is about 872.4278124090.

Adding to 664031232 its reverse (232130466), we get a palindrome (896161698).

The spelling of 664031232 in words is "six hundred sixty-four million, thirty-one thousand, two hundred thirty-two".