128185345 has 8 divisors (see below), whose sum is σ = 154212264. Its totient is φ = 102288384.

The previous prime is 128185333. The next prime is 128185349. The reversal of 128185345 is 543581821.

It can be written as a sum of positive squares in 4 ways, for example, as 31438449 + 96746896 = 5607^2 + 9836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128185345 - 2⁵ = 128185313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128185349) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30304 + ... + 34273.

It is an arithmetic number, because the mean of its divisors is an integer number (19276533).

Almost surely, 2^128185345 is an apocalyptic number.

It is an amenable number.

128185345 is a deficient number, since it is larger than the sum of its proper divisors (26026919).

128185345 is an equidigital number, since it uses as much as digits as its factorization.

128185345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64979.

The product of its digits is 38400, while the sum is 37.

The square root of 128185345 is about 11321.8967050579. The cubic root of 128185345 is about 504.2115527128.

The spelling of 128185345 in words is "one hundred twenty-eight million, one hundred eighty-five thousand, three hundred forty-five".