28054809 has 8 divisors (see below), whose sum is σ = 41562720. Its totient is φ = 18703188.

The previous prime is 28054781. The next prime is 28054813. The reversal of 28054809 is 90845082.

It is not a de Polignac number, because 28054809 - 2¹⁵ = 28022041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28054889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519507 + ... + 519560.

It is an arithmetic number, because the mean of its divisors is an integer number (5195340).

Almost surely, 2^28054809 is an apocalyptic number.

It is an amenable number.

28054809 is a deficient number, since it is larger than the sum of its proper divisors (13507911).

28054809 is a wasteful number, since it uses less digits than its factorization.

28054809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039076 (or 1039070 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28054809 is about 5296.6790538978. The cubic root of 28054809 is about 303.8569018634.

The spelling of 28054809 in words is "twenty-eight million, fifty-four thousand, eight hundred nine".