648868128 has 24 divisors (see below), whose sum is σ = 1703279088. Its totient is φ = 216289344.

The previous prime is 648868063. The next prime is 648868141. The reversal of 648868128 is 821868846.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

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, 3379426 + ... + 3379617.

It is an arithmetic number, because the mean of its divisors is an integer number (70969962).

Almost surely, 2^648868128 is an apocalyptic number.

It is an amenable number.

648868128 is an abundant number, since it is smaller than the sum of its proper divisors (1054410960).

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

648868128 is a wasteful number, since it uses less digits than its factorization.

648868128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759056 (or 6759048 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 51.

The square root of 648868128 is about 25472.8900598263. The cubic root of 648868128 is about 865.7360071604.

The spelling of 648868128 in words is "six hundred forty-eight million, eight hundred sixty-eight thousand, one hundred twenty-eight".