640305132 has 24 divisors (see below), whose sum is σ = 1495343472. Its totient is φ = 213249600.

The previous prime is 640305089. The next prime is 640305151. The reversal of 640305132 is 231503046.

It is a happy number.

640305132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8419 + ... + 36762.

It is an arithmetic number, because the mean of its divisors is an integer number (62305978).

Almost surely, 2^640305132 is an apocalyptic number.

It is an amenable number.

640305132 is an abundant number, since it is smaller than the sum of its proper divisors (855038340).

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

640305132 is a wasteful number, since it uses less digits than its factorization.

640305132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46369 (or 46367 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 640305132 is about 25304.2512633747. The cubic root of 640305132 is about 861.9108098710.

Adding to 640305132 its reverse (231503046), we get a palindrome (871808178).

The spelling of 640305132 in words is "six hundred forty million, three hundred five thousand, one hundred thirty-two".