28082111 has 4 divisors (see below), whose sum is σ = 28142712. Its totient is φ = 28021512.

The previous prime is 28082107. The next prime is 28082161. The reversal of 28082111 is 11128082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28082111 - 2² = 28082107 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 (28082101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29600 + ... + 30533.

It is an arithmetic number, because the mean of its divisors is an integer number (7035678).

Almost surely, 2^28082111 is an apocalyptic number.

28082111 is a deficient number, since it is larger than the sum of its proper divisors (60601).

28082111 is an equidigital number, since it uses as much as digits as its factorization.

28082111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60600.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 28082111 is about 5299.2557024548. The cubic root of 28082111 is about 303.9554376913.

The spelling of 28082111 in words is "twenty-eight million, eighty-two thousand, one hundred eleven".