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BaseRepresentation
bin111000010110111
31110120201
413002313
51410410
6341331
7150061
oct70267
943521
1028855
111a752
1214847
1310198
14a731
15883a
hex70b7

28855 has 8 divisors (see below), whose sum is σ = 36000. Its totient is φ = 22176.

The previous prime is 28843. The next prime is 28859. The reversal of 28855 is 55882.

It can be divided in two parts, 288 and 55, that added together give a palindrome (343).

28855 = T28 + T29 + ... + T57.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28855 - 213 = 20663 is a prime.

It is a super-2 number, since 2×288552 = 1665222050, which contains 22 as substring.

28855 is a lucky number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 244.

It is an arithmetic number, because the mean of its divisors is an integer number (4500).

228855 is an apocalyptic number.

28855 is a deficient number, since it is larger than the sum of its proper divisors (7145).

28855 is a wasteful number, since it uses less digits than its factorization.

28855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its digits is 3200, while the sum is 28.

The square root of 28855 is about 169.8675954972. The cubic root of 28855 is about 30.6718773964.

The spelling of 28855 in words is "twenty-eight thousand, eight hundred fifty-five".

Divisors: 1 5 29 145 199 995 5771 28855