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BaseRepresentation
bin111000100001111
31110200222
413010033
51411233
6341555
7150245
oct70417
943628
1028943
111a822
12148bb
1310235
14a795
158898
hex710f

28943 has 4 divisors (see below), whose sum is σ = 29328. Its totient is φ = 28560.

The previous prime is 28933. The next prime is 28949. The reversal of 28943 is 34982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34982 = 217491.

It is a cyclic number.

It is not a de Polignac number, because 28943 - 24 = 28927 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28949) 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, 38 + ... + 243.

It is an arithmetic number, because the mean of its divisors is an integer number (7332).

228943 is an apocalyptic number.

28943 is a deficient number, since it is larger than the sum of its proper divisors (385).

28943 is a wasteful number, since it uses less digits than its factorization.

28943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its digits is 1728, while the sum is 26.

The square root of 28943 is about 170.1264235796. The cubic root of 28943 is about 30.7030260822.

The spelling of 28943 in words is "twenty-eight thousand, nine hundred forty-three".

Divisors: 1 103 281 28943