640452068 has 24 divisors (see below), whose sum is σ = 1137776640. Its totient is φ = 315385920.

The previous prime is 640452047. The next prime is 640452097. The reversal of 640452068 is 860254046.

It is an unprimeable number.

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, 302333 + ... + 304443.

It is an arithmetic number, because the mean of its divisors is an integer number (47407360).

Almost surely, 2^640452068 is an apocalyptic number.

It is an amenable number.

640452068 is a deficient number, since it is larger than the sum of its proper divisors (497324572).

640452068 is a wasteful number, since it uses less digits than its factorization.

640452068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227 (or 3225 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 640452068 is about 25307.1544824779. The cubic root of 640452068 is about 861.9767347112.

The spelling of 640452068 in words is "six hundred forty million, four hundred fifty-two thousand, sixty-eight".