28061 has 4 divisors (see below), whose sum is σ = 30624.
Its totient is φ = 25500.
The previous prime is 28057. The next prime is 28069. The reversal of 28061 is 16082.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 28061 - 22 = 28057 is a prime.
It is a Curzon number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28061.
It is not an unprimeable number, because it can be changed into a prime (28069) 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, 1265 + ... + 1286.
It is an arithmetic number, because the mean of its divisors is an integer number (7656).
228061 is an apocalyptic number.
It is an amenable number.
28061 is a deficient number, since it is larger than the sum of its proper divisors (2563).
28061 is a wasteful number, since it uses less digits than its factorization.
28061 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2562.
The product of its (nonzero) digits is 96, while the sum is 17.
The square root of 28061 is about 167.5141785044.
The cubic root of 28061 is about 30.3879251445.
The spelling of 28061 in words is "twenty-eight thousand, sixty-one".