28271171 has 4 divisors (see below), whose sum is σ = 28300200. Its totient is φ = 28242144.

The previous prime is 28271137. The next prime is 28271179. The reversal of 28271171 is 17117282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28271171 - 2²² = 24076867 is a prime.

It is a super-2 number, since 2×28271171² = 1598518219422482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28271179) 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 3 ways as a sum of consecutive naturals, for example, 13001 + ... + 15018.

It is an arithmetic number, because the mean of its divisors is an integer number (7075050).

Almost surely, 2^28271171 is an apocalyptic number.

28271171 is a deficient number, since it is larger than the sum of its proper divisors (29029).

28271171 is a wasteful number, since it uses less digits than its factorization.

28271171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29028.

The product of its digits is 1568, while the sum is 29.

The square root of 28271171 is about 5317.0641335233. The cubic root of 28271171 is about 304.6360291455.

The spelling of 28271171 in words is "twenty-eight million, two hundred seventy-one thousand, one hundred seventy-one".