Search a number
BaseRepresentation
bin111000000000000
31110022221
413000000
51404142
6340424
7146410
oct70000
943287
1028672
111a5a6
1214714
1310087
14a640
158767
hex7000

28672 has 26 divisors (see below), whose sum is σ = 65528. Its totient is φ = 12288.

The previous prime is 28669. The next prime is 28687. The reversal of 28672 is 27682.

Subtracting from 28672 its reverse (27682), we obtain a triangular number (990 = T44).

28672 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is a nialpdrome in base 2, base 8, base 14 and base 16.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4093 + ... + 4099.

28672 is a Friedman number, since it can be written as 7*(8*(6+2))^2, using all its digits and the basic arithmetic operations.

228672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32764).

28672 is an abundant number, since it is smaller than the sum of its proper divisors (36856).

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

28672 is an frugal number, since it uses more digits than its factorization.

28672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31 (or 9 counting only the distinct ones).

The product of its digits is 1344, while the sum is 25.

The square root of 28672 is about 169.3280839081. The cubic root of 28672 is about 30.6068989244.

The spelling of 28672 in words is "twenty-eight thousand, six hundred seventy-two".