Search a number
28887 = 39629
BaseRepresentation
bin111000011010111
31110121220
413003113
51411022
6341423
7150135
oct70327
943556
1028887
111a781
1214873
13101c1
14a755
15885c
hex70d7

28887 has 4 divisors (see below), whose sum is σ = 38520. Its totient is φ = 19256.

The previous prime is 28879. The next prime is 28901. The reversal of 28887 is 78882.

Adding to 28887 its sum of digits (33), we get a triangular number (28920 = T240).

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28887 - 23 = 28879 is a prime.

It is a D-number.

28887 is a lucky number.

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 28887.

It is not an unprimeable number, because it can be changed into a prime (28807) 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, 4812 + ... + 4817.

It is an arithmetic number, because the mean of its divisors is an integer number (9630).

228887 is an apocalyptic number.

28887 is a deficient number, since it is larger than the sum of its proper divisors (9633).

28887 is an equidigital number, since it uses as much as digits as its factorization.

28887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9632.

The product of its digits is 7168, while the sum is 33.

The square root of 28887 is about 169.9617604051. The cubic root of 28887 is about 30.6832115092.

The spelling of 28887 in words is "twenty-eight thousand, eight hundred eighty-seven".

Divisors: 1 3 9629 28887