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28197 = 3213241
BaseRepresentation
bin110111000100101
31102200100
412320211
51400242
6334313
7145131
oct67045
942610
1028197
111a204
1214399
13cab0
14a3c1
15854c
hex6e25

28197 has 12 divisors (see below), whose sum is σ = 44044. Its totient is φ = 17280.

The previous prime is 28183. The next prime is 28201. The reversal of 28197 is 79182.

It can be written as a sum of positive squares in 2 ways, for example, as 12321 + 15876 = 111^2 + 126^2 .

It is not a de Polignac number, because 28197 - 24 = 28181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4 + ... + 237.

228197 is an apocalyptic number.

It is an amenable number.

28197 is a deficient number, since it is larger than the sum of its proper divisors (15847).

28197 is a wasteful number, since it uses less digits than its factorization.

28197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 257 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 28197 is about 167.9196236299. The cubic root of 28197 is about 30.4369385932.

Adding to 28197 its sum of digits (27), we get a square (28224 = 1682).

It can be divided in two parts, 281 and 97, that added together give a triangular number (378 = T27).

The spelling of 28197 in words is "twenty-eight thousand, one hundred ninety-seven".

Divisors: 1 3 9 13 39 117 241 723 2169 3133 9399 28197