3968321128 has 8 divisors (see below), whose sum is σ = 7440602130. Its totient is φ = 1984160560.

The previous prime is 3968321117. The next prime is 3968321153. The reversal of 3968321128 is 8211238693.

3968321128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2175476164 + 1792844964 = 46642^2 + 42342^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248020063 + ... + 248020078.

Almost surely, 2^3968321128 is an apocalyptic number.

It is an amenable number.

3968321128 is a deficient number, since it is larger than the sum of its proper divisors (3472281002).

3968321128 is a wasteful number, since it uses less digits than its factorization.

3968321128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496040147 (or 496040143 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 3968321128 is about 62994.6118965741. The cubic root of 3968321128 is about 1583.1993507113.

The spelling of 3968321128 in words is "three billion, nine hundred sixty-eight million, three hundred twenty-one thousand, one hundred twenty-eight".