640426060624 has 20 divisors (see below), whose sum is σ = 1418086277344. Its totient is φ = 274468311648.

The previous prime is 640426060517. The next prime is 640426060643. The reversal of 640426060624 is 426060624046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2859044802 + ... + 2859045025.

Almost surely, 2^640426060624 is an apocalyptic number.

It is an amenable number.

640426060624 is an abundant number, since it is smaller than the sum of its proper divisors (777660216720).

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

640426060624 is a wasteful number, since it uses less digits than its factorization.

640426060624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718089842 (or 5718089836 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 640426060624 in words is "six hundred forty billion, four hundred twenty-six million, sixty thousand, six hundred twenty-four".