640593284 has 48 divisors (see below), whose sum is σ = 1220493120. Its totient is φ = 293155200.

The previous prime is 640593281. The next prime is 640593293. The reversal of 640593284 is 482395046.

It is not an unprimeable number, because it can be changed into a prime (640593281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440759 + ... + 442209.

It is an arithmetic number, because the mean of its divisors is an integer number (25426940).

Almost surely, 2^640593284 is an apocalyptic number.

It is an amenable number.

640593284 is a deficient number, since it is larger than the sum of its proper divisors (579899836).

640593284 is a wasteful number, since it uses less digits than its factorization.

640593284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668 (or 1666 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 640593284 is about 25309.9443697532. The cubic root of 640593284 is about 862.0400836940.

The spelling of 640593284 in words is "six hundred forty million, five hundred ninety-three thousand, two hundred eighty-four".