28118481 has 4 divisors (see below), whose sum is σ = 37491312. Its totient is φ = 18745652.

The previous prime is 28118479. The next prime is 28118507. The reversal of 28118481 is 18481182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28118481 - 2¹ = 28118479 is a prime.

It is a super-2 number, since 2×28118481² = 1581297947494722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28118411) 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, 4686411 + ... + 4686416.

It is an arithmetic number, because the mean of its divisors is an integer number (9372828).

Almost surely, 2^28118481 is an apocalyptic number.

It is an amenable number.

28118481 is a deficient number, since it is larger than the sum of its proper divisors (9372831).

28118481 is an equidigital number, since it uses as much as digits as its factorization.

28118481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372830.

The product of its digits is 4096, while the sum is 33.

The square root of 28118481 is about 5302.6862060658. The cubic root of 28118481 is about 304.0866017410.

The spelling of 28118481 in words is "twenty-eight million, one hundred eighteen thousand, four hundred eighty-one".