28449169 has 4 divisors (see below), whose sum is σ = 32513344. Its totient is φ = 24384996.

The previous prime is 28449167. The next prime is 28449191. The reversal of 28449169 is 96194482.

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 28449169 - 2¹ = 28449167 is a prime.

It is a super-2 number, since 2×28449169² = 1618710433581122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28449167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032077 + ... + 2032090.

It is an arithmetic number, because the mean of its divisors is an integer number (8128336).

Almost surely, 2^28449169 is an apocalyptic number.

It is an amenable number.

28449169 is a deficient number, since it is larger than the sum of its proper divisors (4064175).

28449169 is an equidigital number, since it uses as much as digits as its factorization.

28449169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064174.

The product of its digits is 124416, while the sum is 43.

The square root of 28449169 is about 5333.7762420259. The cubic root of 28449169 is about 305.2740312433.

The spelling of 28449169 in words is "twenty-eight million, four hundred forty-nine thousand, one hundred sixty-nine".