128775871 has 12 divisors (see below), whose sum is σ = 150707088. Its totient is φ = 109711392.

The previous prime is 128775859. The next prime is 128775883. The reversal of 128775871 is 178577821.

It is an interprime number because it is at equal distance from previous prime (128775859) and next prime (128775883).

It is not a de Polignac number, because 128775871 - 2⁵ = 128775839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128775851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315 + ... + 16051.

It is an arithmetic number, because the mean of its divisors is an integer number (12558924).

Almost surely, 2^128775871 is an apocalyptic number.

128775871 is a deficient number, since it is larger than the sum of its proper divisors (21931217).

128775871 is a wasteful number, since it uses less digits than its factorization.

128775871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15918 (or 15911 counting only the distinct ones).

The product of its digits is 219520, while the sum is 46.

The square root of 128775871 is about 11347.9456731163. The cubic root of 128775871 is about 504.9846363329.

The spelling of 128775871 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, eight hundred seventy-one".