28184121 has 48 divisors (see below), whose sum is σ = 48657024. Its totient is φ = 15386112.

The previous prime is 28184111. The next prime is 28184141. The reversal of 28184121 is 12148182.

It is not a de Polignac number, because 28184121 - 2¹⁰ = 28183097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28184111) 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 47 ways as a sum of consecutive naturals, for example, 249361 + ... + 249473.

It is an arithmetic number, because the mean of its divisors is an integer number (1013688).

Almost surely, 2^28184121 is an apocalyptic number.

28184121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28184121 is a deficient number, since it is larger than the sum of its proper divisors (20472903).

28184121 is a wasteful number, since it uses less digits than its factorization.

28184121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 267 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 28184121 is about 5308.8719140699. The cubic root of 28184121 is about 304.3230385630.

The spelling of 28184121 in words is "twenty-eight million, one hundred eighty-four thousand, one hundred twenty-one".