Search a number
BaseRepresentation
bin110111111110000
31110022100
412333300
51404111
6340400
7146355
oct67760
943270
1028656
111a591
1214700
1310074
14a62c
158756
hex6ff0

28656 has 30 divisors (see below), whose sum is σ = 80600. Its totient is φ = 9504.

The previous prime is 28649. The next prime is 28657. The reversal of 28656 is 65682.

28656 is a `hidden beast` number, since 2 + 8 + 656 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45 + ... + 243.

228656 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 28656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40300).

28656 is an abundant number, since it is smaller than the sum of its proper divisors (51944).

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

28656 is a wasteful number, since it uses less digits than its factorization.

28656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 204 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 28656 is about 169.2808317560. The cubic root of 28656 is about 30.6012046175.

The spelling of 28656 in words is "twenty-eight thousand, six hundred fifty-six".