28261 has 4 divisors (see below), whose sum is σ = 28800. Its totient is φ = 27724.

The previous prime is 28229. The next prime is 28277. The reversal of 28261 is 16282.

It is a happy number.

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 28261 - 2⁵ = 28229 is a prime.

It is a d-powerful number, because it can be written as 2² + 8⁴ + 2¹⁴ + 6⁵ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201) 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, 181 + ... + 298.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

2²⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

28261 is a deficient number, since it is larger than the sum of its proper divisors (539).

28261 is an equidigital number, since it uses as much as digits as its factorization.

28261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538.

The product of its digits is 192, while the sum is 19.

The square root of 28261 is about 168.1100829814. The cubic root of 28261 is about 30.4599492224.

It can be divided in two parts, 282 and 61, that added together give a palindrome (343).

The spelling of 28261 in words is "twenty-eight thousand, two hundred sixty-one".