128775139 has 16 divisors (see below), whose sum is σ = 134233632. Its totient is φ = 123475968.

The previous prime is 128775131. The next prime is 128775149. The reversal of 128775139 is 931577821.

It is a cyclic number.

It is not a de Polignac number, because 128775139 - 2³ = 128775131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128775095 and 128775104.

It is not an unprimeable number, because it can be changed into a prime (128775131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552567 + ... + 552799.

It is an arithmetic number, because the mean of its divisors is an integer number (8389602).

Almost surely, 2^128775139 is an apocalyptic number.

128775139 is a deficient number, since it is larger than the sum of its proper divisors (5458493).

128775139 is a wasteful number, since it uses less digits than its factorization.

128775139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its digits is 105840, while the sum is 43.

The square root of 128775139 is about 11347.9134205368. The cubic root of 128775139 is about 504.9836795039.

The spelling of 128775139 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, one hundred thirty-nine".