28075111 has 4 divisors (see below), whose sum is σ = 29295792. Its totient is φ = 26854432.

The previous prime is 28075097. The next prime is 28075129. The reversal of 28075111 is 11157082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28075111 - 2⁷ = 28074983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28075511) 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 3 ways as a sum of consecutive naturals, for example, 610306 + ... + 610351.

It is an arithmetic number, because the mean of its divisors is an integer number (7323948).

Almost surely, 2^28075111 is an apocalyptic number.

28075111 is a deficient number, since it is larger than the sum of its proper divisors (1220681).

28075111 is a wasteful number, since it uses less digits than its factorization.

28075111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220680.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 28075111 is about 5298.5951911804. The cubic root of 28075111 is about 303.9301800356.

The spelling of 28075111 in words is "twenty-eight million, seventy-five thousand, one hundred eleven".