28144249 has 16 divisors (see below), whose sum is σ = 34652160. Its totient is φ = 22326480.

The previous prime is 28144247. The next prime is 28144261. The reversal of 28144249 is 94244182.

It is a cyclic number.

It is not a de Polignac number, because 28144249 - 2¹ = 28144247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28144243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2172 + ... + 7810.

It is an arithmetic number, because the mean of its divisors is an integer number (2165760).

Almost surely, 2^28144249 is an apocalyptic number.

It is an amenable number.

28144249 is a deficient number, since it is larger than the sum of its proper divisors (6507911).

28144249 is a wasteful number, since it uses less digits than its factorization.

28144249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700.

The product of its digits is 18432, while the sum is 34.

The square root of 28144249 is about 5305.1153616109. The cubic root of 28144249 is about 304.1794625087.

The spelling of 28144249 in words is "twenty-eight million, one hundred forty-four thousand, two hundred forty-nine".