664043532 has 24 divisors (see below), whose sum is σ = 1559838000. Its totient is φ = 219861696.

The previous prime is 664043531. The next prime is 664043533. The reversal of 664043532 is 235340466.

It is an interprime number because it is at equal distance from previous prime (664043531) and next prime (664043533).

It is a junction number, because it is equal to n+sod(n) for n = 664043493 and 664043502.

It is not an unprimeable number, because it can be changed into a prime (664043531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183907 + ... + 187482.

It is an arithmetic number, because the mean of its divisors is an integer number (64993250).

Almost surely, 2^664043532 is an apocalyptic number.

It is an amenable number.

664043532 is an abundant number, since it is smaller than the sum of its proper divisors (895794468).

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

664043532 is a wasteful number, since it uses less digits than its factorization.

664043532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371545 (or 371543 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 664043532 is about 25769.0421242234. The cubic root of 664043532 is about 872.4331991013.

Adding to 664043532 its reverse (235340466), we get a palindrome (899383998).

The spelling of 664043532 in words is "six hundred sixty-four million, forty-three thousand, five hundred thirty-two".