28072183 has 4 divisors (see below), whose sum is σ = 28082808. Its totient is φ = 28061560.

The previous prime is 28072169. The next prime is 28072189. The reversal of 28072183 is 38127082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28072183 - 2⁹ = 28071671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28072189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085 + ... + 7777.

It is an arithmetic number, because the mean of its divisors is an integer number (7020702).

Almost surely, 2^28072183 is an apocalyptic number.

28072183 is a deficient number, since it is larger than the sum of its proper divisors (10625).

28072183 is an equidigital number, since it uses as much as digits as its factorization.

28072183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10624.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28072183 is about 5298.3188843255. The cubic root of 28072183 is about 303.9196138736.

The spelling of 28072183 in words is "twenty-eight million, seventy-two thousand, one hundred eighty-three".