28118123 has 4 divisors (see below), whose sum is σ = 30674328. Its totient is φ = 25561920.

The previous prime is 28118117. The next prime is 28118131. The reversal of 28118123 is 32181182.

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 28118123 - 2⁴ = 28118107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28118092 and 28118101.

It is not an unprimeable number, because it can be changed into a prime (28118183) 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, 1278086 + ... + 1278107.

It is an arithmetic number, because the mean of its divisors is an integer number (7668582).

Almost surely, 2^28118123 is an apocalyptic number.

28118123 is a deficient number, since it is larger than the sum of its proper divisors (2556205).

28118123 is a wasteful number, since it uses less digits than its factorization.

28118123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556204.

The product of its digits is 768, while the sum is 26.

The square root of 28118123 is about 5302.6524494822. The cubic root of 28118123 is about 304.0853112082.

The spelling of 28118123 in words is "twenty-eight million, one hundred eighteen thousand, one hundred twenty-three".