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28257 = 39419
BaseRepresentation
bin110111001100001
31102202120
412321201
51401012
6334453
7145245
oct67141
942676
1028257
111a259
1214429
13cb28
14a425
15858c
hex6e61

28257 has 4 divisors (see below), whose sum is σ = 37680. Its totient is φ = 18836.

The previous prime is 28229. The next prime is 28277. The reversal of 28257 is 75282.

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.

It is a cyclic number.

It is not a de Polignac number, because 28257 - 28 = 28001 is a prime.

It is an Ulam number.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28257.

It is not an unprimeable number, because it can be changed into a prime (28277) 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, 4707 + ... + 4712.

It is an arithmetic number, because the mean of its divisors is an integer number (9420).

228257 is an apocalyptic number.

It is an amenable number.

28257 is a deficient number, since it is larger than the sum of its proper divisors (9423).

28257 is an equidigital number, since it uses as much as digits as its factorization.

28257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9422.

The product of its digits is 1120, while the sum is 24.

The square root of 28257 is about 168.0981855940. The cubic root of 28257 is about 30.4585120764.

The spelling of 28257 in words is "twenty-eight thousand, two hundred fifty-seven".

Divisors: 1 3 9419 28257