Search a number
-
+
28661 is a prime number
BaseRepresentation
bin110111111110101
31110022112
412333311
51404121
6340405
7146363
oct67765
943275
1028661
111a596
1214705
1310079
14a633
15875b
hex6ff5

28661 has 2 divisors, whose sum is σ = 28662. Its totient is φ = 28660.

The previous prime is 28657. The next prime is 28663. The reversal of 28661 is 16682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28561 + 100 = 169^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 28661 - 22 = 28657 is a prime.

Together with 28663, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 14.

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 28661.

It is not a weakly prime, because it can be changed into another prime (28663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14330 + 14331.

It is an arithmetic number, because the mean of its divisors is an integer number (14331).

228661 is an apocalyptic number.

It is an amenable number.

28661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28661 is an equidigital number, since it uses as much as digits as its factorization.

28661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 28661 is about 169.2955994703. The cubic root of 28661 is about 30.6029843160.

The spelling of 28661 in words is "twenty-eight thousand, six hundred sixty-one".