664500432 has 80 divisors (see below), whose sum is σ = 1809527040. Its totient is φ = 209803776.

The previous prime is 664500409. The next prime is 664500467. The reversal of 664500432 is 234005466.

It is a self number, because there is not a number n which added to its sum of digits gives 664500432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69273 + ... + 78279.

It is an arithmetic number, because the mean of its divisors is an integer number (22619088).

Almost surely, 2^664500432 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 664500432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904763520).

664500432 is an abundant number, since it is smaller than the sum of its proper divisors (1145026608).

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

664500432 is a wasteful number, since it uses less digits than its factorization.

664500432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100 (or 9094 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 664500432 is about 25777.9058885705. The cubic root of 664500432 is about 872.6332479039.

Adding to 664500432 its reverse (234005466), we get a palindrome (898505898).

The spelling of 664500432 in words is "six hundred sixty-four million, five hundred thousand, four hundred thirty-two".