128781875 has 10 divisors (see below), whose sum is σ = 160926612. Its totient is φ = 103025000.

The previous prime is 128781871. The next prime is 128781881. The reversal of 128781875 is 578187821.

It is not a de Polignac number, because 128781875 - 2² = 128781871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128781871) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 102401 + ... + 103650.

Almost surely, 2^128781875 is an apocalyptic number.

128781875 is a deficient number, since it is larger than the sum of its proper divisors (32144737).

128781875 is an frugal number, since it uses more digits than its factorization.

128781875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206071 (or 206056 counting only the distinct ones).

The product of its digits is 250880, while the sum is 47.

The square root of 128781875 is about 11348.2102113065. The cubic root of 128781875 is about 504.9924842851.

The spelling of 128781875 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, eight hundred seventy-five".