28145 has 8 divisors (see below), whose sum is σ = 36456. Its totient is φ = 20736.

The previous prime is 28123. The next prime is 28151. The reversal of 28145 is 54182.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 27889 = 16^2 + 167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28145 - 2⁶ = 28081 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152 + ... + 281.

It is an arithmetic number, because the mean of its divisors is an integer number (4557).

2²⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

28145 is a deficient number, since it is larger than the sum of its proper divisors (8311).

28145 is a wasteful number, since it uses less digits than its factorization.

28145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451.

The product of its digits is 320, while the sum is 20.

The square root of 28145 is about 167.7647161950. The cubic root of 28145 is about 30.4182168056.

It can be divided in two parts, 2 and 8145, that multiplied together give a triangular number (16290 = T₁₈₀).

The spelling of 28145 in words is "twenty-eight thousand, one hundred forty-five".