27557 has 4 divisors (see below), whose sum is σ = 29196.
Its totient is φ = 25920.
The previous prime is 27551. The next prime is 27581. The reversal of 27557 is 75572.
It is a Cunningham number, because it is equal to 1662+1.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 21316 + 6241 = 146^2 + 79^2
It is a cyclic number.
It is not a de Polignac number, because 27557 - 24 = 27541 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (27551) 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, 794 + ... + 827.
It is an arithmetic number, because the mean of its divisors is an integer number (7299).
227557 is an apocalyptic number.
It is an amenable number.
27557 is a deficient number, since it is larger than the sum of its proper divisors (1639).
27557 is a wasteful number, since it uses less digits than its factorization.
27557 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1638.
The product of its digits is 2450, while the sum is 26.
The square root of 27557 is about 166.0030120209.
The cubic root of 27557 is about 30.2048937291.
The spelling of 27557 in words is "twenty-seven thousand, five hundred fifty-seven".