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28860 = 22351337
BaseRepresentation
bin111000010111100
31110120220
413002330
51410420
6341340
7150066
oct70274
943526
1028860
111a757
1214850
13101a0
14a736
158840
hex70bc

28860 has 48 divisors (see below), whose sum is σ = 89376. Its totient is φ = 6912.

The previous prime is 28859. The next prime is 28867. The reversal of 28860 is 6882.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 28860.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (1862).

228860 is an apocalyptic number.

28860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44688).

28860 is an abundant number, since it is smaller than the sum of its proper divisors (60516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28860 is a wasteful number, since it uses less digits than its factorization.

28860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28860 is about 169.8823122047. The cubic root of 28860 is about 30.6736489037.

It can be divided in two parts, 28 and 860, that added together give a palindrome (888).

The spelling of 28860 in words is "twenty-eight thousand, eight hundred sixty".

Divisors: 1 2 3 4 5 6 10 12 13 15 20 26 30 37 39 52 60 65 74 78 111 130 148 156 185 195 222 260 370 390 444 481 555 740 780 962 1110 1443 1924 2220 2405 2886 4810 5772 7215 9620 14430 28860