28181433 has 16 divisors (see below), whose sum is σ = 43489280. Its totient is φ = 15898896.

The previous prime is 28181429. The next prime is 28181453. The reversal of 28181433 is 33418182.

It is not a de Polignac number, because 28181433 - 2² = 28181429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28181433.

It is not an unprimeable number, because it can be changed into a prime (28181453) 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 15 ways as a sum of consecutive naturals, for example, 6835 + ... + 10152.

It is an arithmetic number, because the mean of its divisors is an integer number (2718080).

Almost surely, 2^28181433 is an apocalyptic number.

It is an amenable number.

28181433 is a deficient number, since it is larger than the sum of its proper divisors (15307847).

28181433 is a wasteful number, since it uses less digits than its factorization.

28181433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17076.

The product of its digits is 4608, while the sum is 30.

The square root of 28181433 is about 5308.6187469058. The cubic root of 28181433 is about 304.3133635367.

The spelling of 28181433 in words is "twenty-eight million, one hundred eighty-one thousand, four hundred thirty-three".