640450127328 has 96 divisors (see below), whose sum is σ = 1841627031552. Its totient is φ = 193270425600.

The previous prime is 640450127293. The next prime is 640450127393. The reversal of 640450127328 is 823721054046.

640450127328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 640450127328.

It is a congruent number.

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, 1003776 + ... + 1512767.

It is an arithmetic number, because the mean of its divisors is an integer number (19183614912).

Almost surely, 2^640450127328 is an apocalyptic number.

It is an amenable number.

640450127328 is an abundant number, since it is smaller than the sum of its proper divisors (1201176904224).

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

640450127328 is a wasteful number, since it uses less digits than its factorization.

640450127328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516808 (or 2516800 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 640450127328 in words is "six hundred forty billion, four hundred fifty million, one hundred twenty-seven thousand, three hundred twenty-eight".