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28011 = 39337
BaseRepresentation
bin110110101101011
31102102110
412311223
51344021
6333403
7144444
oct66553
942373
1028011
111a055
1214263
13c999
14a2cb
158476
hex6d6b

28011 has 4 divisors (see below), whose sum is σ = 37352. Its totient is φ = 18672.

The previous prime is 28001. The next prime is 28019. The reversal of 28011 is 11082.

It is a happy number.

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

It is not a de Polignac number, because 28011 - 26 = 27947 is a prime.

It is a super-2 number, since 2×280112 = 1569232242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a nialpdrome in base 8 and base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28011.

It is not an unprimeable number, because it can be changed into a prime (28019) 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, 4666 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (9338).

228011 is an apocalyptic number.

28011 is a deficient number, since it is larger than the sum of its proper divisors (9341).

28011 is an equidigital number, since it uses as much as digits as its factorization.

28011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9340.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 28011 is about 167.3648708660. The cubic root of 28011 is about 30.3698656837.

Adding to 28011 its reverse (11082), we get a palindrome (39093).

The spelling of 28011 in words is "twenty-eight thousand, eleven".

Divisors: 1 3 9337 28011