28097849 has 4 divisors (see below), whose sum is σ = 30259236. Its totient is φ = 25936464.

The previous prime is 28097813. The next prime is 28097921. The reversal of 28097849 is 94879082.

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 10725625 + 17372224 = 3275^2 + 4168^2 .

It is a cyclic number.

It is not a de Polignac number, because 28097849 - 2⁸ = 28097593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28099849) 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, 1080674 + ... + 1080699.

It is an arithmetic number, because the mean of its divisors is an integer number (7564809).

Almost surely, 2^28097849 is an apocalyptic number.

It is an amenable number.

28097849 is a deficient number, since it is larger than the sum of its proper divisors (2161387).

28097849 is a wasteful number, since it uses less digits than its factorization.

28097849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161386.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28097849 is about 5300.7404199791. The cubic root of 28097849 is about 304.0122087952.

The spelling of 28097849 in words is "twenty-eight million, ninety-seven thousand, eight hundred forty-nine".