128255 has 8 divisors (see below), whose sum is σ = 155952. Its totient is φ = 101248.

The previous prime is 128239. The next prime is 128257. The reversal of 128255 is 552821.

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

It is not a de Polignac number, because 128255 - 2⁴ = 128239 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128255.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128255.

It is not an unprimeable number, because it can be changed into a prime (128257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (19494).

2¹²⁸²⁵⁵ is an apocalyptic number.

128255 is a deficient number, since it is larger than the sum of its proper divisors (27697).

128255 is a wasteful number, since it uses less digits than its factorization.

128255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its digits is 800, while the sum is 23.

The square root of 128255 is about 358.1270724198. The cubic root of 128255 is about 50.4302864493.

It can be divided in two parts, 128 and 255, that multiplied together give a triangular number (32640 = T₂₅₅).

The spelling of 128255 in words is "one hundred twenty-eight thousand, two hundred fifty-five".