28235143 has 4 divisors (see below), whose sum is σ = 28309248. Its totient is φ = 28161040.

The previous prime is 28235111. The next prime is 28235149. The reversal of 28235143 is 34153282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34153282 = 2 ⋅17076641.

It is a cyclic number.

It is not a de Polignac number, because 28235143 - 2⁵ = 28235111 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 (28235149) 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, 36478 + ... + 37243.

It is an arithmetic number, because the mean of its divisors is an integer number (7077312).

Almost surely, 2^28235143 is an apocalyptic number.

28235143 is a deficient number, since it is larger than the sum of its proper divisors (74105).

28235143 is an equidigital number, since it uses as much as digits as its factorization.

28235143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74104.

The product of its digits is 5760, while the sum is 28.

The square root of 28235143 is about 5313.6750935675. The cubic root of 28235143 is about 304.5065675535.

The spelling of 28235143 in words is "twenty-eight million, two hundred thirty-five thousand, one hundred forty-three".