664432532 has 12 divisors (see below), whose sum is σ = 1194183060. Its totient is φ = 323237376.

The previous prime is 664432523. The next prime is 664432537. The reversal of 664432532 is 235234466.

It can be written as a sum of positive squares in 2 ways, for example, as 489028996 + 175403536 = 22114^2 + 13244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664432492 and 664432501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664432537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244557 + ... + 2244852.

It is an arithmetic number, because the mean of its divisors is an integer number (99515255).

Almost surely, 2^664432532 is an apocalyptic number.

It is an amenable number.

664432532 is a deficient number, since it is larger than the sum of its proper divisors (529750528).

664432532 is a wasteful number, since it uses less digits than its factorization.

664432532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489450 (or 4489448 counting only the distinct ones).

The product of its digits is 103680, while the sum is 35.

The square root of 664432532 is about 25776.5888356082. The cubic root of 664432532 is about 872.6035244139.

Adding to 664432532 its reverse (235234466), we get a palindrome (899666998).

The spelling of 664432532 in words is "six hundred sixty-four million, four hundred thirty-two thousand, five hundred thirty-two".