28273217 has 16 divisors (see below), whose sum is σ = 33430272. Its totient is φ = 23405760.

The previous prime is 28273211. The next prime is 28273241. The reversal of 28273217 is 71237282.

It is not a de Polignac number, because 28273217 - 2¹⁰ = 28272193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28273211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44492 + ... + 45122.

It is an arithmetic number, because the mean of its divisors is an integer number (2089392).

Almost surely, 2^28273217 is an apocalyptic number.

It is an amenable number.

28273217 is a deficient number, since it is larger than the sum of its proper divisors (5157055).

28273217 is a wasteful number, since it uses less digits than its factorization.

28273217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848.

The product of its digits is 9408, while the sum is 32.

The square root of 28273217 is about 5317.2565294520. The cubic root of 28273217 is about 304.6433778599.

The spelling of 28273217 in words is "twenty-eight million, two hundred seventy-three thousand, two hundred seventeen".