128807056609 has 81 divisors (see below), whose sum is σ = 169682953041. Its totient is φ = 97419001680.

The previous prime is 128807056603. The next prime is 128807056613. The reversal of 128807056609 is 906650708821.

The square root of 128807056609 is 358897.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 128807056609 - 2³ = 128807056601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128807056601) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1630469032 + ... + 1630469110.

Almost surely, 2^128807056609 is an apocalyptic number.

128807056609 is the 358897-th square number.

128807056609 is the 179449-th centered octagonal number.

It is an amenable number.

128807056609 is a deficient number, since it is larger than the sum of its proper divisors (40875896432).

128807056609 is an frugal number, since it uses more digits than its factorization.

128807056609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 128807056609 in words is "one hundred twenty-eight billion, eight hundred seven million, fifty-six thousand, six hundred nine".