128875857 has 8 divisors (see below), whose sum is σ = 187455840. Its totient is φ = 78106560.

The previous prime is 128875853. The next prime is 128875867. The reversal of 128875857 is 758578821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128875857 - 2² = 128875853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128875853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1952632 + ... + 1952697.

It is an arithmetic number, because the mean of its divisors is an integer number (23431980).

Almost surely, 2^128875857 is an apocalyptic number.

It is an amenable number.

128875857 is a deficient number, since it is larger than the sum of its proper divisors (58579983).

128875857 is a wasteful number, since it uses less digits than its factorization.

128875857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905343.

The product of its digits is 1254400, while the sum is 51.

The square root of 128875857 is about 11352.3502852933. The cubic root of 128875857 is about 505.1152983152.

It can be divided in two parts, 1288758 and 57, that added together give a triangular number (1288815 = T₁₆₀₅).

The spelling of 128875857 in words is "one hundred twenty-eight million, eight hundred seventy-five thousand, eight hundred fifty-seven".