640503434032 has 80 divisors (see below), whose sum is σ = 1550504547072. Its totient is φ = 249012207360.

The previous prime is 640503434029. The next prime is 640503434113. The reversal of 640503434032 is 230434305046.

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, 18718 + ... + 1131970.

Almost surely, 2^640503434032 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 640503434032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775252273536).

640503434032 is an abundant number, since it is smaller than the sum of its proper divisors (910001113040).

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

640503434032 is a wasteful number, since it uses less digits than its factorization.

640503434032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113746 (or 1113740 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 34.

Adding to 640503434032 its reverse (230434305046), we get a palindrome (870937739078).

The spelling of 640503434032 in words is "six hundred forty billion, five hundred three million, four hundred thirty-four thousand, thirty-two".