28258109 has 8 divisors (see below), whose sum is σ = 31350240. Its totient is φ = 25253200.

The previous prime is 28258057. The next prime is 28258129. The reversal of 28258109 is 90185282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28258109 - 2²⁴ = 11480893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28258129) 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 7 ways as a sum of consecutive naturals, for example, 21122 + ... + 22419.

It is an arithmetic number, because the mean of its divisors is an integer number (3918780).

Almost surely, 2^28258109 is an apocalyptic number.

It is an amenable number.

28258109 is a deficient number, since it is larger than the sum of its proper divisors (3092131).

28258109 is a wasteful number, since it uses less digits than its factorization.

28258109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43611.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 28258109 is about 5315.8356821858. The cubic root of 28258109 is about 304.5891053871.

The spelling of 28258109 in words is "twenty-eight million, two hundred fifty-eight thousand, one hundred nine".