640283168 has 48 divisors (see below), whose sum is σ = 1442528640. Its totient is φ = 274046976.

The previous prime is 640283167. The next prime is 640283173. The reversal of 640283168 is 861382046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640283167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236768 + ... + 239456.

It is an arithmetic number, because the mean of its divisors is an integer number (30052680).

Almost surely, 2^640283168 is an apocalyptic number.

It is an amenable number.

640283168 is an abundant number, since it is smaller than the sum of its proper divisors (802245472).

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

640283168 is a wasteful number, since it uses less digits than its factorization.

640283168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769 (or 3761 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 640283168 is about 25303.8172614331. The cubic root of 640283168 is about 861.9009545564.

The spelling of 640283168 in words is "six hundred forty million, two hundred eighty-three thousand, one hundred sixty-eight".