128322785 has 4 divisors (see below), whose sum is σ = 153987348. Its totient is φ = 102658224.

The previous prime is 128322739. The next prime is 128322791. The reversal of 128322785 is 587223821.

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 76020961 + 52301824 = 8719^2 + 7232^2 .

It is a cyclic number.

It is not a de Polignac number, because 128322785 - 2⁶ = 128322721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12832274 + ... + 12832283.

It is an arithmetic number, because the mean of its divisors is an integer number (38496837).

Almost surely, 2^128322785 is an apocalyptic number.

It is an amenable number.

128322785 is a deficient number, since it is larger than the sum of its proper divisors (25664563).

128322785 is an equidigital number, since it uses as much as digits as its factorization.

128322785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25664562.

The product of its digits is 53760, while the sum is 38.

The square root of 128322785 is about 11327.9647333491. The cubic root of 128322785 is about 504.3916931264.

The spelling of 128322785 in words is "one hundred twenty-eight million, three hundred twenty-two thousand, seven hundred eighty-five".