640484420052 has 24 divisors (see below), whose sum is σ = 1516769076256. Its totient is φ = 210308316768.

The previous prime is 640484420041. The next prime is 640484420161. The reversal of 640484420052 is 250024484046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398310403 + ... + 398312010.

Almost surely, 2^640484420052 is an apocalyptic number.

It is an amenable number.

640484420052 is an abundant number, since it is smaller than the sum of its proper divisors (876284656204).

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

640484420052 is a wasteful number, since it uses less digits than its factorization.

640484420052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796622487 (or 796622485 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 39.

The spelling of 640484420052 in words is "six hundred forty billion, four hundred eighty-four million, four hundred twenty thousand, fifty-two".