28057 has 2 divisors, whose sum is σ = 28058.
Its totient is φ = 28056.
The previous prime is 28051. The next prime is 28069. The reversal of 28057 is 75082.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 24336 + 3721 = 156^2 + 61^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-28057 is a prime.
It is the 168-th Hogben number.
It is a nialpdrome in base 8 and base 14.
It is not a weakly prime, because it can be changed into another prime (28051) by changing a digit.
It is a nontrivial repunit in base 167.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028 + 14029.
It is an arithmetic number, because the mean of its divisors is an integer number (14029).
228057 is an apocalyptic number.
It is an amenable number.
28057 is a deficient number, since it is larger than the sum of its proper divisors (1).
28057 is an equidigital number, since it uses as much as digits as its factorization.
28057 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 560, while the sum is 22.
The square root of 28057 is about 167.5022387910.
The cubic root of 28057 is about 30.3864811775.
The spelling of 28057 in words is "twenty-eight thousand, fifty-seven".