28009171 has 2 divisors, whose sum is σ = 28009172. Its totient is φ = 28009170.

The previous prime is 28009153. The next prime is 28009181. The reversal of 28009171 is 17190082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28009171 - 2⁵ = 28009139 is a prime.

It is a super-3 number, since 3×28009171³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28009181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14004585 + 14004586.

It is an arithmetic number, because the mean of its divisors is an integer number (14004586).

Almost surely, 2^28009171 is an apocalyptic number.

28009171 is a deficient number, since it is larger than the sum of its proper divisors (1).

28009171 is an equidigital number, since it uses as much as digits as its factorization.

28009171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28009171 is about 5292.3691292275. The cubic root of 28009171 is about 303.6920466132.

The spelling of 28009171 in words is "twenty-eight million, nine thousand, one hundred seventy-one".