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28983 = 39661
BaseRepresentation
bin111000100110111
31110202110
413010313
51411413
6342103
7150333
oct70467
943673
1028983
111a859
1214933
1310266
14a7c3
1588c3
hex7137

28983 has 4 divisors (see below), whose sum is σ = 38648. Its totient is φ = 19320.

The previous prime is 28979. The next prime is 29009. The reversal of 28983 is 38982.

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

It is not a de Polignac number, because 28983 - 22 = 28979 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28933) 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, 4828 + ... + 4833.

It is an arithmetic number, because the mean of its divisors is an integer number (9662).

228983 is an apocalyptic number.

28983 is a deficient number, since it is larger than the sum of its proper divisors (9665).

28983 is an equidigital number, since it uses as much as digits as its factorization.

28983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9664.

The product of its digits is 3456, while the sum is 30.

The square root of 28983 is about 170.2439426235. The cubic root of 28983 is about 30.7171637057.

Subtracting 28983 from its reverse (38982), we obtain a palindrome (9999).

The spelling of 28983 in words is "twenty-eight thousand, nine hundred eighty-three".

Divisors: 1 3 9661 28983