640322020000 has 240 divisors, whose sum is σ = 1720407693312. Its totient is φ = 233089920000.

The previous prime is 640322019959. The next prime is 640322020073. The reversal of 640322020000 is 20223046.

It is a self number, because there is not a number n which added to its sum of digits gives 640322020000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18442657 + ... + 18477343.

Almost surely, 2^640322020000 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 640322020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860203846656).

640322020000 is an abundant number, since it is smaller than the sum of its proper divisors (1080085673312).

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

640322020000 is a wasteful number, since it uses less digits than its factorization.

640322020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34801 (or 34778 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 640322020000 its reverse (20223046), we get a palindrome (640342243046).

The spelling of 640322020000 in words is "six hundred forty billion, three hundred twenty-two million, twenty thousand".