640128576 has 56 divisors (see below), whose sum is σ = 1696394880. Its totient is φ = 213033472.

The previous prime is 640128569. The next prime is 640128637. The reversal of 640128576 is 675821046.

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, 135730 + ... + 140366.

Almost surely, 2^640128576 is an apocalyptic number.

It is an amenable number.

640128576 is an abundant number, since it is smaller than the sum of its proper divisors (1056266304).

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

640128576 is a wasteful number, since it uses less digits than its factorization.

640128576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 640128576 is about 25300.7623600555. The cubic root of 640128576 is about 861.8315822724.

The spelling of 640128576 in words is "six hundred forty million, one hundred twenty-eight thousand, five hundred seventy-six".