648681868 has 12 divisors (see below), whose sum is σ = 1135553440. Its totient is φ = 324238032.

The previous prime is 648681863. The next prime is 648681871. The reversal of 648681868 is 868186846.

It is not an unprimeable number, because it can be changed into a prime (648681863) 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 3 ways as a sum of consecutive naturals, for example, 10548 + ... + 37531.

Almost surely, 2^648681868 is an apocalyptic number.

It is an amenable number.

648681868 is a deficient number, since it is larger than the sum of its proper divisors (486871572).

648681868 is a wasteful number, since it uses less digits than its factorization.

648681868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51456 (or 51454 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 55.

The square root of 648681868 is about 25469.2337536880. The cubic root of 648681868 is about 865.6531616568.

The spelling of 648681868 in words is "six hundred forty-eight million, six hundred eighty-one thousand, eight hundred sixty-eight".