128721750876 has 18 divisors (see below), whose sum is σ = 325379981472. Its totient is φ = 42907250280.

The previous prime is 128721750739. The next prime is 128721750877. The reversal of 128721750876 is 678057127821.

128721750876 is a `hidden beast` number, since 128 + 7 + 2 + 1 + 7 + 508 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128721750877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1787802060 + ... + 1787802131.

Almost surely, 2^128721750876 is an apocalyptic number.

It is an amenable number.

128721750876 is an abundant number, since it is smaller than the sum of its proper divisors (196658230596).

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

128721750876 is a wasteful number, since it uses less digits than its factorization.

128721750876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575604201 (or 3575604196 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The spelling of 128721750876 in words is "one hundred twenty-eight billion, seven hundred twenty-one million, seven hundred fifty thousand, eight hundred seventy-six".