640308160 has 28 divisors (see below), whose sum is σ = 1524734568. Its totient is φ = 256123136.

The previous prime is 640308143. The next prime is 640308167. The reversal of 640308160 is 61803046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640308167) 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, 1000162 + ... + 1000801.

It is an arithmetic number, because the mean of its divisors is an integer number (54454806).

Almost surely, 2^640308160 is an apocalyptic number.

It is an amenable number.

640308160 is an abundant number, since it is smaller than the sum of its proper divisors (884426408).

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

640308160 is a wasteful number, since it uses less digits than its factorization.

640308160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000980 (or 2000970 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 640308160 is about 25304.3110951474. The cubic root of 640308160 is about 861.9121685263.

The spelling of 640308160 in words is "six hundred forty million, three hundred eight thousand, one hundred sixty".