640846768 has 20 divisors (see below), whose sum is σ = 1242043768. Its totient is φ = 320319360.

The previous prime is 640846747. The next prime is 640846777. The reversal of 640846768 is 867648046.

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 3 ways as a sum of consecutive naturals, for example, 76180 + ... + 84172.

Almost surely, 2^640846768 is an apocalyptic number.

It is an amenable number.

640846768 is a deficient number, since it is larger than the sum of its proper divisors (601197000).

640846768 is a wasteful number, since it uses less digits than its factorization.

640846768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13012 (or 13006 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The square root of 640846768 is about 25314.9514714131. The cubic root of 640846768 is about 862.1537723419.

The spelling of 640846768 in words is "six hundred forty million, eight hundred forty-six thousand, seven hundred sixty-eight".