28471 has 4 divisors (see below), whose sum is σ = 28944. Its totient is φ = 28000.

The previous prime is 28463. The next prime is 28477. The reversal of 28471 is 17482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17482 = 2 ⋅8741.

It is a cyclic number.

It is not a de Polignac number, because 28471 - 2³ = 28463 is a prime.

It is a super-3 number, since 3×28471³ = 69235593393333, which contains 333 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130 + ... + 271.

It is an arithmetic number, because the mean of its divisors is an integer number (7236).

2²⁸⁴⁷¹ is an apocalyptic number.

28471 is a deficient number, since it is larger than the sum of its proper divisors (473).

28471 is an equidigital number, since it uses as much as digits as its factorization.

28471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its digits is 448, while the sum is 22.

The square root of 28471 is about 168.7335177136. The cubic root of 28471 is about 30.5352097184.

It can be divided in two parts, 284 and 71, that multiplied together give a square (20164 = 142²).

The spelling of 28471 in words is "twenty-eight thousand, four hundred seventy-one".