128867 has 4 divisors (see below), whose sum is σ = 133056. Its totient is φ = 124680.

The previous prime is 128861. The next prime is 128873. The reversal of 128867 is 768821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768821 = 23 ⋅33427.

It is an interprime number because it is at equal distance from previous prime (128861) and next prime (128873).

It is a cyclic number.

It is not a de Polignac number, because 128867 - 2¹⁰ = 127843 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128867.

It is not an unprimeable number, because it can be changed into a prime (128861) 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, 2048 + ... + 2109.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2¹²⁸⁸⁶⁷ is an apocalyptic number.

128867 is a deficient number, since it is larger than the sum of its proper divisors (4189).

128867 is an equidigital number, since it uses as much as digits as its factorization.

128867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188.

The product of its digits is 5376, while the sum is 32.

The square root of 128867 is about 358.9805008632. The cubic root of 128867 is about 50.5103726692.

The spelling of 128867 in words is "one hundred twenty-eight thousand, eight hundred sixty-seven".