28019 has 2 divisors, whose sum is σ = 28020.
Its totient is φ = 28018.
The previous prime is 28001. The next prime is 28027. The reversal of 28019 is 91082.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 28019 - 28 = 27763 is a prime.
It is a super-2 number, since 2×280192 = 1570128722, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is a plaindrome in base 7.
It is not a weakly prime, because it can be changed into another prime (28069) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009 + 14010.
It is an arithmetic number, because the mean of its divisors is an integer number (14010).
228019 is an apocalyptic number.
28019 is a deficient number, since it is larger than the sum of its proper divisors (1).
28019 is an equidigital number, since it uses as much as digits as its factorization.
28019 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 144, while the sum is 20.
The square root of 28019 is about 167.3887690378.
The cubic root of 28019 is about 30.3727566408.
The spelling of 28019 in words is "twenty-eight thousand, nineteen".