640456360 has 32 divisors (see below), whose sum is σ = 1441981440. Its totient is φ = 256012864.

The previous prime is 640456343. The next prime is 640456361. The reversal of 640456360 is 63654046.

It is not an unprimeable number, because it can be changed into a prime (640456361) 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, 68529 + ... + 77311.

It is an arithmetic number, because the mean of its divisors is an integer number (45061920).

Almost surely, 2^640456360 is an apocalyptic number.

It is an amenable number.

640456360 is an abundant number, since it is smaller than the sum of its proper divisors (801525080).

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

640456360 is a wasteful number, since it uses less digits than its factorization.

640456360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617 (or 10613 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 640456360 is about 25307.2392804905. The cubic root of 640456360 is about 861.9786602240.

The spelling of 640456360 in words is "six hundred forty million, four hundred fifty-six thousand, three hundred sixty".