28064 has 12 divisors (see below), whose sum is σ = 55314.
Its totient is φ = 14016.
The previous prime is 28057. The next prime is 28069. The reversal of 28064 is 46082.
It can be written as a sum of positive squares in only one way, i.e., 19600 + 8464 = 140^2 + 92^2
It is an Ulam number.
It is a nialpdrome in base 8.
It is not an unprimeable number, because it can be changed into a prime (28069) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407 + ... + 470.
228064 is an apocalyptic number.
It is an amenable number.
28064 is a deficient number, since it is larger than the sum of its proper divisors (27250).
28064 is an equidigital number, since it uses as much as digits as its factorization.
28064 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 887 (or 879 counting only the distinct ones).
The product of its (nonzero) digits is 384, while the sum is 20.
The square root of 28064 is about 167.5231327310.
The cubic root of 28064 is about 30.3890080297.
The spelling of 28064 in words is "twenty-eight thousand, sixty-four".