28178 has 8 divisors (see below), whose sum is σ = 43068. Its totient is φ = 13824.

The previous prime is 28163. The next prime is 28181. The reversal of 28178 is 87182.

It can be written as a sum of positive squares in 2 ways, for example, as 27889 + 289 = 167^2 + 17^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 13.

It is an unprimeable number.

28178 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 242.

2²⁸¹⁷⁸ is an apocalyptic number.

28178 is a deficient number, since it is larger than the sum of its proper divisors (14890).

28178 is a wasteful number, since it uses less digits than its factorization.

28178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268.

The product of its digits is 896, while the sum is 26.

The square root of 28178 is about 167.8630394101. The cubic root of 28178 is about 30.4301006107.

The spelling of 28178 in words is "twenty-eight thousand, one hundred seventy-eight".