28226 has 8 divisors (see below), whose sum is σ = 46224. Its totient is φ = 12820.

The previous prime is 28219. The next prime is 28229. The reversal of 28226 is 62282.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28198 and 28207.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28226.

It is not an unprimeable number, because it can be changed into a prime (28229) by changing a digit.

28226 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, 620 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (5778).

28226 is a Friedman number, since it can be written as (28*6)^2+2, using all its digits and the basic arithmetic operations.

2²⁸²²⁶ is an apocalyptic number.

28226 is a deficient number, since it is larger than the sum of its proper divisors (17998).

28226 is a wasteful number, since it uses less digits than its factorization.

28226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its digits is 384, while the sum is 20.

The square root of 28226 is about 168.0059522755. The cubic root of 28226 is about 30.4473695940.

It can be divided in two parts, 28 and 226, that multiplied together give a triangular number (6328 = T₁₁₂).

The spelling of 28226 in words is "twenty-eight thousand, two hundred twenty-six".