28121119 has 4 divisors (see below), whose sum is σ = 30284296. Its totient is φ = 25957944.

The previous prime is 28121117. The next prime is 28121129. The reversal of 28121119 is 91112182.

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 28121119 - 2¹ = 28121117 is a prime.

It is a super-2 number, since 2×28121119² = 1581594667624322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28121093 and 28121102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121113) 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, 1081569 + ... + 1081594.

It is an arithmetic number, because the mean of its divisors is an integer number (7571074).

Almost surely, 2^28121119 is an apocalyptic number.

28121119 is a deficient number, since it is larger than the sum of its proper divisors (2163177).

28121119 is a wasteful number, since it uses less digits than its factorization.

28121119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163176.

The product of its digits is 288, while the sum is 25.

The square root of 28121119 is about 5302.9349420863. The cubic root of 28121119 is about 304.0961109717.

The spelling of 28121119 in words is "twenty-eight million, one hundred twenty-one thousand, one hundred nineteen".