648055513728 has 128 divisors (see below), whose sum is σ = 2185901616000. Its totient is φ = 185158711296.

The previous prime is 648055513711. The next prime is 648055513733. The reversal of 648055513728 is 827315550846.

648055513728 is a `hidden beast` number, since 6 + 4 + 8 + 0 + 55 + 513 + 72 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13369813 + ... + 13418196.

It is an arithmetic number, because the mean of its divisors is an integer number (17077356375).

Almost surely, 2^648055513728 is an apocalyptic number.

It is an amenable number.

648055513728 is an abundant number, since it is smaller than the sum of its proper divisors (1537846102272).

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

648055513728 is a wasteful number, since it uses less digits than its factorization.

648055513728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26788039 (or 26788021 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 648055513728 in words is "six hundred forty-eight billion, fifty-five million, five hundred thirteen thousand, seven hundred twenty-eight".