28073905 has 4 divisors (see below), whose sum is σ = 33688692. Its totient is φ = 22459120.

The previous prime is 28073873. The next prime is 28073917. The reversal of 28073905 is 50937082.

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 2903616 + 25170289 = 1704^2 + 5017^2 .

It is not a de Polignac number, because 28073905 - 2⁵ = 28073873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807386 + ... + 2807395.

It is an arithmetic number, because the mean of its divisors is an integer number (8422173).

Almost surely, 2^28073905 is an apocalyptic number.

It is an amenable number.

28073905 is a deficient number, since it is larger than the sum of its proper divisors (5614787).

28073905 is an equidigital number, since it uses as much as digits as its factorization.

28073905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614786.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 28073905 is about 5298.4813862087. The cubic root of 28073905 is about 303.9258280783.

The spelling of 28073905 in words is "twenty-eight million, seventy-three thousand, nine hundred five".