128909875 has 8 divisors (see below), whose sum is σ = 160879680. Its totient is φ = 103127800.

The previous prime is 128909857. The next prime is 128909881. The reversal of 128909875 is 578909821.

It is not a de Polignac number, because 128909875 - 2⁷ = 128909747 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515515 + ... + 515764.

It is an arithmetic number, because the mean of its divisors is an integer number (20109960).

Almost surely, 2^128909875 is an apocalyptic number.

128909875 is a deficient number, since it is larger than the sum of its proper divisors (31969805).

128909875 is an equidigital number, since it uses as much as digits as its factorization.

128909875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031294 (or 1031284 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 128909875 is about 11353.8484664892. The cubic root of 128909875 is about 505.1597377237.

The spelling of 128909875 in words is "one hundred twenty-eight million, nine hundred nine thousand, eight hundred seventy-five".