128085 has 8 divisors (see below), whose sum is σ = 204960. Its totient is φ = 68304.

The previous prime is 128053. The next prime is 128099. The reversal of 128085 is 580821.

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

It is not a de Polignac number, because 128085 - 2⁵ = 128053 is a prime.

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, 4255 + ... + 4284.

It is an arithmetic number, because the mean of its divisors is an integer number (25620).

2¹²⁸⁰⁸⁵ is an apocalyptic number.

128085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128085 is a deficient number, since it is larger than the sum of its proper divisors (76875).

128085 is an equidigital number, since it uses as much as digits as its factorization.

128085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8547.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 128085 is about 357.8896477966. The cubic root of 128085 is about 50.4079950783.

It can be divided in two parts, 12 and 8085, that multiplied together give a triangular number (97020 = T₄₄₀).

The spelling of 128085 in words is "one hundred twenty-eight thousand, eighty-five".