28142 has 4 divisors (see below), whose sum is σ = 42216. Its totient is φ = 14070.

The previous prime is 28123. The next prime is 28151. The reversal of 28142 is 24182.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 28142.

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 28142.

It is an unprimeable number.

28142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7034 + ... + 7037.

It is an arithmetic number, because the mean of its divisors is an integer number (10554).

2²⁸¹⁴² is an apocalyptic number.

28142 is a deficient number, since it is larger than the sum of its proper divisors (14074).

28142 is a wasteful number, since it uses less digits than its factorization.

28142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14073.

The product of its digits is 128, while the sum is 17.

The square root of 28142 is about 167.7557748633. The cubic root of 28142 is about 30.4171359991.

It can be divided in two parts, 281 and 42, that added together give a palindrome (323).

The spelling of 28142 in words is "twenty-eight thousand, one hundred forty-two".