640531307000 has 256 divisors, whose sum is σ = 1635726718080. Its totient is φ = 233362944000.

The previous prime is 640531306999. The next prime is 640531307033. The reversal of 640531307000 is 703135046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 322360007 + ... + 322361993.

Almost surely, 2^640531307000 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 640531307000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817863359040).

640531307000 is an abundant number, since it is smaller than the sum of its proper divisors (995195411080).

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

640531307000 is a wasteful number, since it uses less digits than its factorization.

640531307000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339 (or 2325 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The spelling of 640531307000 in words is "six hundred forty billion, five hundred thirty-one million, three hundred seven thousand".