28184913 has 24 divisors (see below), whose sum is σ = 43400448. Its totient is φ = 17584512.

The previous prime is 28184903. The next prime is 28184939. The reversal of 28184913 is 31948182.

It is not a de Polignac number, because 28184913 - 2⁵ = 28184881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28184903) 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 23 ways as a sum of consecutive naturals, for example, 8281 + ... + 11177.

It is an arithmetic number, because the mean of its divisors is an integer number (1808352).

Almost surely, 2^28184913 is an apocalyptic number.

28184913 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28184913 is a deficient number, since it is larger than the sum of its proper divisors (15215535).

28184913 is a wasteful number, since it uses less digits than its factorization.

28184913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973 (or 2970 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28184913 is about 5308.9465056638. The cubic root of 28184913 is about 304.3258891231.

The spelling of 28184913 in words is "twenty-eight million, one hundred eighty-four thousand, nine hundred thirteen".