Base | Representation |
---|---|
bin | 110110111000111 |
3 | 1102112212 |
4 | 12313013 |
5 | 1344403 |
6 | 334035 |
7 | 144635 |
oct | 66707 |
9 | 42485 |
10 | 28103 |
11 | 1a129 |
12 | 1431b |
13 | ca3a |
14 | a355 |
15 | 84d8 |
hex | 6dc7 |
28103 has 4 divisors (see below), whose sum is σ = 28440. Its totient is φ = 27768.
The previous prime is 28099. The next prime is 28109. The reversal of 28103 is 30182.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 30182 = 2 ⋅15091.
It is a cyclic number.
It is not a de Polignac number, because 28103 - 22 = 28099 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28103.
It is not an unprimeable number, because it can be changed into a prime (28109) 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, 68 + ... + 246.
It is an arithmetic number, because the mean of its divisors is an integer number (7110).
228103 is an apocalyptic number.
28103 is a deficient number, since it is larger than the sum of its proper divisors (337).
28103 is a wasteful number, since it uses less digits than its factorization.
28103 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 336.
The product of its (nonzero) digits is 48, while the sum is 14.
The square root of 28103 is about 167.6394941534. The cubic root of 28103 is about 30.4030785202.
Adding to 28103 its reverse (30182), we get a palindrome (58285).
It can be divided in two parts, 28 and 103, that added together give a palindrome (131).
The spelling of 28103 in words is "twenty-eight thousand, one hundred three".
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