128845 has 8 divisors (see below), whose sum is σ = 157176. Its totient is φ = 101376.

The previous prime is 128837. The next prime is 128857. The reversal of 128845 is 548821.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 116964 = 109^2 + 342^2 .

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 128845 - 2³ = 128837 is a prime.

It is a Duffinian number.

128845 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (19647).

2¹²⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

128845 is a deficient number, since it is larger than the sum of its proper divisors (28331).

128845 is an equidigital number, since it uses as much as digits as its factorization.

128845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 2560, while the sum is 28.

The square root of 128845 is about 358.9498572224. The cubic root of 128845 is about 50.5074981514.

The spelling of 128845 in words is "one hundred twenty-eight thousand, eight hundred forty-five".