28143533 has 4 divisors (see below), whose sum is σ = 30702048. Its totient is φ = 25585020.

The previous prime is 28143527. The next prime is 28143547. The reversal of 28143533 is 33534182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28143533 - 2²² = 23949229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28143496 and 28143505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28143433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279241 + ... + 1279262.

It is an arithmetic number, because the mean of its divisors is an integer number (7675512).

Almost surely, 2^28143533 is an apocalyptic number.

It is an amenable number.

28143533 is a deficient number, since it is larger than the sum of its proper divisors (2558515).

28143533 is a wasteful number, since it uses less digits than its factorization.

28143533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558514.

The product of its digits is 8640, while the sum is 29.

The square root of 28143533 is about 5305.0478791430. The cubic root of 28143533 is about 304.1768830079.

The spelling of 28143533 in words is "twenty-eight million, one hundred forty-three thousand, five hundred thirty-three".