128720025027 has 24 divisors (see below), whose sum is σ = 202923225648. Its totient is φ = 77976878400.

The previous prime is 128720025017. The next prime is 128720025079. The reversal of 128720025027 is 720520027821.

128720025027 is a `hidden beast` number, since 128 + 7 + 20 + 0 + 2 + 502 + 7 = 666.

It is not a de Polignac number, because 128720025027 - 2⁶ = 128720024963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128720024982 and 128720025000.

It is not an unprimeable number, because it can be changed into a prime (128720025017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72828 + ... + 512585.

It is an arithmetic number, because the mean of its divisors is an integer number (8455134402).

Almost surely, 2^128720025027 is an apocalyptic number.

128720025027 is a deficient number, since it is larger than the sum of its proper divisors (74203200621).

128720025027 is a wasteful number, since it uses less digits than its factorization.

128720025027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587651 (or 587648 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 128720025027 in words is "one hundred twenty-eight billion, seven hundred twenty million, twenty-five thousand, twenty-seven".