640202560 has 28 divisors (see below), whose sum is σ = 1524483108. Its totient is φ = 256080896.

The previous prime is 640202509. The next prime is 640202561. The reversal of 640202560 is 65202046.

It can be written as a sum of positive squares in 2 ways, for example, as 480837184 + 159365376 = 21928^2 + 12624^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640202561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999997 + ... + 1000636.

Almost surely, 2^640202560 is an apocalyptic number.

It is an amenable number.

640202560 is an abundant number, since it is smaller than the sum of its proper divisors (884280548).

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

640202560 is a wasteful number, since it uses less digits than its factorization.

640202560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000650 (or 2000640 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 640202560 is about 25302.2244081425. The cubic root of 640202560 is about 861.8647835666.

The spelling of 640202560 in words is "six hundred forty million, two hundred two thousand, five hundred sixty".