28553 has 4 divisors (see below), whose sum is σ = 32640. Its totient is φ = 24468.

The previous prime is 28549. The next prime is 28559. The reversal of 28553 is 35582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35582 = 2 ⋅17791.

It is a cyclic number.

It is not a de Polignac number, because 28553 - 2² = 28549 is a prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 8⁴ + 5⁴ + 5⁵ + 3⁹ .

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28559) 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, 2033 + ... + 2046.

It is an arithmetic number, because the mean of its divisors is an integer number (8160).

2²⁸⁵⁵³ is an apocalyptic number.

It is an amenable number.

28553 is a deficient number, since it is larger than the sum of its proper divisors (4087).

28553 is an equidigital number, since it uses as much as digits as its factorization.

28553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086.

The product of its digits is 1200, while the sum is 23.

The square root of 28553 is about 168.9763297033. The cubic root of 28553 is about 30.5644966794.

The spelling of 28553 in words is "twenty-eight thousand, five hundred fifty-three".