28058105 has 4 divisors (see below), whose sum is σ = 33669732. Its totient is φ = 22446480.

The previous prime is 28058087. The next prime is 28058113. The reversal of 28058105 is 50185082.

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 15745024 + 12313081 = 3968^2 + 3509^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28058105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2805806 + ... + 2805815.

It is an arithmetic number, because the mean of its divisors is an integer number (8417433).

Almost surely, 2^28058105 is an apocalyptic number.

It is an amenable number.

28058105 is a deficient number, since it is larger than the sum of its proper divisors (5611627).

28058105 is an equidigital number, since it uses as much as digits as its factorization.

28058105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611626.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 28058105 is about 5296.9901831134. The cubic root of 28058105 is about 303.8688008707.

It can be divided in two parts, 280 and 58105, that added together give a palindrome (58385).

The spelling of 28058105 in words is "twenty-eight million, fifty-eight thousand, one hundred five".