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28799 = 31929
BaseRepresentation
bin111000001111111
31110111122
413001333
51410144
6341155
7146651
oct70177
943448
1028799
111a701
12147bb
1310154
14a6d1
1587ee
hex707f

28799 has 4 divisors (see below), whose sum is σ = 29760. Its totient is φ = 27840.

The previous prime is 28793. The next prime is 28807. The reversal of 28799 is 99782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99782 = 249891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28799 is a prime.

It is a plaindrome in base 12.

It is a zygodrome in base 2.

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 28799.

It is not an unprimeable number, because it can be changed into a prime (28793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434 + ... + 495.

It is an arithmetic number, because the mean of its divisors is an integer number (7440).

228799 is an apocalyptic number.

28799 is a deficient number, since it is larger than the sum of its proper divisors (961).

28799 is an equidigital number, since it uses as much as digits as its factorization.

28799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its digits is 9072, while the sum is 35.

The square root of 28799 is about 169.7026811809. The cubic root of 28799 is about 30.6520225188.

The spelling of 28799 in words is "twenty-eight thousand, seven hundred ninety-nine".

Divisors: 1 31 929 28799