28271849 has 4 divisors (see below), whose sum is σ = 28304964. Its totient is φ = 28238736.

The previous prime is 28271827. The next prime is 28271879. The reversal of 28271849 is 94817282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26081449 + 2190400 = 5107^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 28271849 - 2¹⁶ = 28206313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28271879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15242 + ... + 16995.

It is an arithmetic number, because the mean of its divisors is an integer number (7076241).

Almost surely, 2^28271849 is an apocalyptic number.

It is an amenable number.

28271849 is a deficient number, since it is larger than the sum of its proper divisors (33115).

28271849 is an equidigital number, since it uses as much as digits as its factorization.

28271849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33114.

The product of its digits is 64512, while the sum is 41.

The square root of 28271849 is about 5317.1278901302. The cubic root of 28271849 is about 304.6384643893.

The spelling of 28271849 in words is "twenty-eight million, two hundred seventy-one thousand, eight hundred forty-nine".