28047849 has 4 divisors (see below), whose sum is σ = 37397136. Its totient is φ = 18698564.

The previous prime is 28047829. The next prime is 28047863. The reversal of 28047849 is 94874082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28047849 - 2¹³ = 28039657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28047849.

It is not an unprimeable number, because it can be changed into a prime (28047809) 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, 4674639 + ... + 4674644.

It is an arithmetic number, because the mean of its divisors is an integer number (9349284).

Almost surely, 2^28047849 is an apocalyptic number.

It is an amenable number.

28047849 is a deficient number, since it is larger than the sum of its proper divisors (9349287).

28047849 is an equidigital number, since it uses as much as digits as its factorization.

28047849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9349286.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28047849 is about 5296.0219976885. The cubic root of 28047849 is about 303.8317722567.

The spelling of 28047849 in words is "twenty-eight million, forty-seven thousand, eight hundred forty-nine".