640831584 has 48 divisors (see below), whose sum is σ = 1683506160. Its totient is φ = 213442560.

The previous prime is 640831577. The next prime is 640831621. The reversal of 640831584 is 485138046.

It is a tau number, because it is divible by the number of its divisors (48).

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, 205912 + ... + 209000.

It is an arithmetic number, because the mean of its divisors is an integer number (35073045).

Almost surely, 2^640831584 is an apocalyptic number.

It is an amenable number.

640831584 is an abundant number, since it is smaller than the sum of its proper divisors (1042674576).

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

640831584 is a wasteful number, since it uses less digits than its factorization.

640831584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263 (or 5255 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 640831584 is about 25314.6515678174. The cubic root of 640831584 is about 862.1469630977.

The spelling of 640831584 in words is "six hundred forty million, eight hundred thirty-one thousand, five hundred eighty-four".