640926160 has 40 divisors (see below), whose sum is σ = 1703033856. Its totient is φ = 219745920.

The previous prime is 640926151. The next prime is 640926161. The reversal of 640926160 is 61629046.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640926161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571696 + ... + 572815.

Almost surely, 2^640926160 is an apocalyptic number.

It is an amenable number.

640926160 is an abundant number, since it is smaller than the sum of its proper divisors (1062107696).

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

640926160 is a wasteful number, since it uses less digits than its factorization.

640926160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144531 (or 1144525 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 640926160 is about 25316.5195080208. The cubic root of 640926160 is about 862.1893738248.

The spelling of 640926160 in words is "six hundred forty million, nine hundred twenty-six thousand, one hundred sixty".