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28747 = 171989
BaseRepresentation
bin111000001001011
31110102201
413001023
51404442
6341031
7146545
oct70113
943381
1028747
111a664
1214777
1310114
14a695
1587b7
hex704b

28747 has 8 divisors (see below), whose sum is σ = 32400. Its totient is φ = 25344.

The previous prime is 28729. The next prime is 28751. The reversal of 28747 is 74782.

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 28747 - 27 = 28619 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279 + ... + 367.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

228747 is an apocalyptic number.

28747 is a deficient number, since it is larger than the sum of its proper divisors (3653).

28747 is a wasteful number, since it uses less digits than its factorization.

28747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125.

The product of its digits is 3136, while the sum is 28.

The square root of 28747 is about 169.5494028300. The cubic root of 28747 is about 30.6335627868.

The spelling of 28747 in words is "twenty-eight thousand, seven hundred forty-seven".

Divisors: 1 17 19 89 323 1513 1691 28747