215968717728 has 36 divisors (see below), whose sum is σ = 614161041858. Its totient is φ = 71989572480.

The previous prime is 215968717711. The next prime is 215968717753. The reversal of 215968717728 is 827717869512.

215968717728 is a `hidden beast` number, since 2 + 1 + 596 + 8 + 7 + 17 + 7 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 180342910224 + 35625807504 = 424668^2 + 188748^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 5 ways as a sum of consecutive naturals, for example, 374945403 + ... + 374945978.

Almost surely, 2^215968717728 is an apocalyptic number.

It is an amenable number.

215968717728 is an abundant number, since it is smaller than the sum of its proper divisors (398192324130).

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

215968717728 is a wasteful number, since it uses less digits than its factorization.

215968717728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749891397 (or 749891386 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 63.

The spelling of 215968717728 in words is "two hundred fifteen billion, nine hundred sixty-eight million, seven hundred seventeen thousand, seven hundred twenty-eight".