128133085 has 4 divisors (see below), whose sum is σ = 153759708. Its totient is φ = 102506464.

The previous prime is 128133059. The next prime is 128133091. The reversal of 128133085 is 580331821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33304441 + 94828644 = 5771^2 + 9738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128133085 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12813304 + ... + 12813313.

It is an arithmetic number, because the mean of its divisors is an integer number (38439927).

Almost surely, 2^128133085 is an apocalyptic number.

It is an amenable number.

128133085 is a deficient number, since it is larger than the sum of its proper divisors (25626623).

128133085 is an equidigital number, since it uses as much as digits as its factorization.

128133085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25626622.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 128133085 is about 11319.5885525932. The cubic root of 128133085 is about 504.1430225766.

The spelling of 128133085 in words is "one hundred twenty-eight million, one hundred thirty-three thousand, eighty-five".