128455 has 8 divisors (see below), whose sum is σ = 160992. Its totient is φ = 98208.

The previous prime is 128449. The next prime is 128461. The reversal of 128455 is 554821.

It is an interprime number because it is at equal distance from previous prime (128449) and next prime (128461).

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 128455 - 2⁷ = 128327 is a prime.

It is a Duffinian 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, 444 + ... + 673.

It is an arithmetic number, because the mean of its divisors is an integer number (20124).

128455 is a Friedman number, since it can be written as 41*(8+5^5)+2, using all its digits and the basic arithmetic operations.

2¹²⁸⁴⁵⁵ is an apocalyptic number.

128455 is a deficient number, since it is larger than the sum of its proper divisors (32537).

128455 is a wasteful number, since it uses less digits than its factorization.

128455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145.

The product of its digits is 1600, while the sum is 25.

The square root of 128455 is about 358.4061941429. The cubic root of 128455 is about 50.4564863872.

The spelling of 128455 in words is "one hundred twenty-eight thousand, four hundred fifty-five".