28116871 has 4 divisors (see below), whose sum is σ = 28647432. Its totient is φ = 27586312.

The previous prime is 28116841. The next prime is 28116937. The reversal of 28116871 is 17861182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17861182 = 2 ⋅8930591.

It is a cyclic number.

It is not a de Polignac number, because 28116871 - 2⁵ = 28116839 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 (28116841) 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, 265201 + ... + 265306.

It is an arithmetic number, because the mean of its divisors is an integer number (7161858).

Almost surely, 2^28116871 is an apocalyptic number.

28116871 is a deficient number, since it is larger than the sum of its proper divisors (530561).

28116871 is an equidigital number, since it uses as much as digits as its factorization.

28116871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530560.

The product of its digits is 5376, while the sum is 34.

The square root of 28116871 is about 5302.5343940422. The cubic root of 28116871 is about 304.0807978621.

The spelling of 28116871 in words is "twenty-eight million, one hundred sixteen thousand, eight hundred seventy-one".