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28249 = 134153
BaseRepresentation
bin110111001011001
31102202021
412321121
51400444
6334441
7145234
oct67131
942667
1028249
111a251
1214421
13cb20
14a41b
158584
hex6e59

28249 has 8 divisors (see below), whose sum is σ = 31752. Its totient is φ = 24960.

The previous prime is 28229. The next prime is 28277. The reversal of 28249 is 94282.

It can be written as a sum of positive squares in 4 ways, for example, as 25 + 28224 = 5^2 + 168^2 .

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

It is not a de Polignac number, because 28249 - 29 = 27737 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28219) 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, 507 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (3969).

228249 is an apocalyptic number.

It is an amenable number.

28249 is a deficient number, since it is larger than the sum of its proper divisors (3503).

28249 is a wasteful number, since it uses less digits than its factorization.

28249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107.

The product of its digits is 1152, while the sum is 25.

The square root of 28249 is about 168.0743882928. The cubic root of 28249 is about 30.4556373776.

Subtracting from 28249 its sum of digits (25), we obtain a square (28224 = 1682).

The spelling of 28249 in words is "twenty-eight thousand, two hundred forty-nine".

Divisors: 1 13 41 53 533 689 2173 28249