12640253032 has 64 divisors (see below), whose sum is σ = 27491270400. Its totient is φ = 5384816640.

The previous prime is 12640252957. The next prime is 12640253033. The reversal of 12640253032 is 23035204621.

It is not an unprimeable number, because it can be changed into a prime (12640253033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339868 + ... + 375220.

It is an arithmetic number, because the mean of its divisors is an integer number (429551100).

Almost surely, 2^12640253032 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 12640253032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13745635200).

12640253032 is an abundant number, since it is smaller than the sum of its proper divisors (14851017368).

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

12640253032 is a wasteful number, since it uses less digits than its factorization.

12640253032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35626 (or 35622 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 12640253032 its reverse (23035204621), we get a palindrome (35675457653).

The spelling of 12640253032 in words is "twelve billion, six hundred forty million, two hundred fifty-three thousand, thirty-two".