28158249 has 16 divisors (see below), whose sum is σ = 43907072. Its totient is φ = 15715728.

The previous prime is 28158191. The next prime is 28158257. The reversal of 28158249 is 94285182.

It is not a de Polignac number, because 28158249 - 2⁸ = 28157993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28158259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14689 + ... + 16494.

It is an arithmetic number, because the mean of its divisors is an integer number (2744192).

Almost surely, 2^28158249 is an apocalyptic number.

It is an amenable number.

28158249 is a deficient number, since it is larger than the sum of its proper divisors (15748823).

28158249 is a wasteful number, since it uses less digits than its factorization.

28158249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31236.

The product of its digits is 46080, while the sum is 39.

The square root of 28158249 is about 5306.4346787650. The cubic root of 28158249 is about 304.2298908876.

The spelling of 28158249 in words is "twenty-eight million, one hundred fifty-eight thousand, two hundred forty-nine".