128267 has 4 divisors (see below), whose sum is σ = 132720. Its totient is φ = 123816.

The previous prime is 128257. The next prime is 128273. The reversal of 128267 is 762821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128267 - 2⁶ = 128203 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183 + ... + 2240.

It is an arithmetic number, because the mean of its divisors is an integer number (33180).

2¹²⁸²⁶⁷ is an apocalyptic number.

128267 is a deficient number, since it is larger than the sum of its proper divisors (4453).

128267 is an equidigital number, since it uses as much as digits as its factorization.

128267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4452.

The product of its digits is 1344, while the sum is 26.

The square root of 128267 is about 358.1438258577. The cubic root of 128267 is about 50.4318592134.

The spelling of 128267 in words is "one hundred twenty-eight thousand, two hundred sixty-seven".