28147 has 4 divisors (see below), whose sum is σ = 32176. Its totient is φ = 24120.

The previous prime is 28123. The next prime is 28151. The reversal of 28147 is 74182.

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 28147 - 2⁷ = 28019 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (8044).

2²⁸¹⁴⁷ is an apocalyptic number.

28147 is a deficient number, since it is larger than the sum of its proper divisors (4029).

28147 is an equidigital number, since it uses as much as digits as its factorization.

28147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028.

The product of its digits is 448, while the sum is 22.

The square root of 28147 is about 167.7706768181. The cubic root of 28147 is about 30.4189373005.

The spelling of 28147 in words is "twenty-eight thousand, one hundred forty-seven".