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28357 = 74051
BaseRepresentation
bin110111011000101
31102220021
412323011
51401412
6335141
7145450
oct67305
942807
1028357
111a33a
12144b1
13cba4
14a497
158607
hex6ec5

28357 has 4 divisors (see below), whose sum is σ = 32416. Its totient is φ = 24300.

The previous prime is 28351. The next prime is 28387. The reversal of 28357 is 75382.

Adding to 28357 its sum of digits (25), we get a palindrome (28382).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75382 = 237691.

It is a cyclic number.

It is not a de Polignac number, because 28357 - 23 = 28349 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28351) 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, 2019 + ... + 2032.

It is an arithmetic number, because the mean of its divisors is an integer number (8104).

228357 is an apocalyptic number.

It is an amenable number.

28357 is a deficient number, since it is larger than the sum of its proper divisors (4059).

28357 is an equidigital number, since it uses as much as digits as its factorization.

28357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058.

The product of its digits is 1680, while the sum is 25.

The square root of 28357 is about 168.3953681073. The cubic root of 28357 is about 30.4944001186.

The spelling of 28357 in words is "twenty-eight thousand, three hundred fifty-seven".

Divisors: 1 7 4051 28357