28549 has 2 divisors, whose sum is σ = 28550. Its totient is φ = 28548.

The previous prime is 28547. The next prime is 28559. The reversal of 28549 is 94582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20449 + 8100 = 143^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 28549 - 2¹ = 28547 is a prime.

Together with 28547, it forms a pair of twin primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14274 + 14275.

It is an arithmetic number, because the mean of its divisors is an integer number (14275).

2²⁸⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

28549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28549 is an equidigital number, since it uses as much as digits as its factorization.

28549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 28549 is about 168.9644933115. The cubic root of 28549 is about 30.5630693490.

The spelling of 28549 in words is "twenty-eight thousand, five hundred forty-nine".