128567 has 4 divisors (see below), whose sum is σ = 130200. Its totient is φ = 126936.

The previous prime is 128563. The next prime is 128591. The reversal of 128567 is 765821.

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 128567 - 2² = 128563 is a prime.

It is a d-powerful number, because it can be written as 1 + 2³ + 5⁵ + 8 + 6⁵ + 7⁶ .

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128563) 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, 692 + ... + 857.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2¹²⁸⁵⁶⁷ is an apocalyptic number.

128567 is a deficient number, since it is larger than the sum of its proper divisors (1633).

128567 is an equidigital number, since it uses as much as digits as its factorization.

128567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632.

The product of its digits is 3360, while the sum is 29.

The square root of 128567 is about 358.5624073993. The cubic root of 128567 is about 50.4711464754.

The spelling of 128567 in words is "one hundred twenty-eight thousand, five hundred sixty-seven".