28286173 has 4 divisors (see below), whose sum is σ = 28329628. Its totient is φ = 28242720.

The previous prime is 28286171. The next prime is 28286183. The reversal of 28286173 is 37168282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37168282 = 2 ⋅18584141.

It can be written as a sum of positive squares in 2 ways, for example, as 18818244 + 9467929 = 4338^2 + 3077^2 .

It is a cyclic number.

It is not a de Polignac number, because 28286173 - 2¹ = 28286171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28286171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20736 + ... + 22057.

It is an arithmetic number, because the mean of its divisors is an integer number (7082407).

Almost surely, 2^28286173 is an apocalyptic number.

It is an amenable number.

28286173 is a deficient number, since it is larger than the sum of its proper divisors (43455).

28286173 is an equidigital number, since it uses as much as digits as its factorization.

28286173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43454.

The product of its digits is 32256, while the sum is 37.

The square root of 28286173 is about 5318.4746873516. The cubic root of 28286173 is about 304.6899043054.

The spelling of 28286173 in words is "twenty-eight million, two hundred eighty-six thousand, one hundred seventy-three".