28184481 has 12 divisors (see below), whose sum is σ = 43842708. Its totient is φ = 17344224.

The previous prime is 28184461. The next prime is 28184531. The reversal of 28184481 is 18448182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5716881 + 22467600 = 2391^2 + 4740^2 .

It is not a de Polignac number, because 28184481 - 2⁵ = 28184449 is a prime.

It is a super-2 number, since 2×28184481² = 1588729938478722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28184411) 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 11 ways as a sum of consecutive naturals, for example, 120330 + ... + 120563.

It is an arithmetic number, because the mean of its divisors is an integer number (3653559).

Almost surely, 2^28184481 is an apocalyptic number.

It is an amenable number.

28184481 is a deficient number, since it is larger than the sum of its proper divisors (15658227).

28184481 is a wasteful number, since it uses less digits than its factorization.

28184481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240912 (or 240909 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 28184481 is about 5308.9058194698. The cubic root of 28184481 is about 304.3243342788.

The spelling of 28184481 in words is "twenty-eight million, one hundred eighty-four thousand, four hundred eighty-one".