57281 has 8 divisors (see below), whose sum is σ = 67200. Its totient is φ = 48804.

The previous prime is 57271. The next prime is 57283. The reversal of 57281 is 18275.

It is not a de Polignac number, because 57281 - 2¹⁴ = 40897 is a prime.

It is a super-2 number, since 2×57281² = 6562225922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 426.

It is an arithmetic number, because the mean of its divisors is an integer number (8400).

2⁵⁷²⁸¹ is an apocalyptic number.

It is an amenable number.

57281 is a deficient number, since it is larger than the sum of its proper divisors (9919).

57281 is an equidigital number, since it uses as much as digits as its factorization.

57281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 174 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 57281 is about 239.3344939619. The cubic root of 57281 is about 38.5481491247.

The spelling of 57281 in words is "fifty-seven thousand, two hundred eighty-one".