640565200 has 120 divisors (see below), whose sum is σ = 1689668640. Its totient is φ = 231436800.

The previous prime is 640565179. The next prime is 640565213. The reversal of 640565200 is 2565046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 866431 + ... + 867169.

It is an arithmetic number, because the mean of its divisors is an integer number (14080572).

Almost surely, 2^640565200 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640565200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844834320).

640565200 is an abundant number, since it is smaller than the sum of its proper divisors (1049103440).

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

640565200 is a wasteful number, since it uses less digits than its factorization.

640565200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 640565200 is about 25309.3895619788. The cubic root of 640565200 is about 862.0274860557.

The spelling of 640565200 in words is "six hundred forty million, five hundred sixty-five thousand, two hundred".