28647 has 8 divisors (see below), whose sum is σ = 42480. Its totient is φ = 19080.

The previous prime is 28643. The next prime is 28649. The reversal of 28647 is 74682.

It is not a de Polignac number, because 28647 - 2² = 28643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1061 = 28647 / (2 + 8 + 6 + 4 + 7).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 28647.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28647.

It is not an unprimeable number, because it can be changed into a prime (28643) 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, 504 + ... + 557.

It is an arithmetic number, because the mean of its divisors is an integer number (5310).

2²⁸⁶⁴⁷ is an apocalyptic number.

28647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28647 is a deficient number, since it is larger than the sum of its proper divisors (13833).

28647 is a wasteful number, since it uses less digits than its factorization.

28647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070 (or 1064 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28647 is about 169.2542466232. The cubic root of 28647 is about 30.5980006383.

It can be divided in two parts, 286 and 47, that added together give a palindrome (333).

The spelling of 28647 in words is "twenty-eight thousand, six hundred forty-seven".