28711243 has 6 divisors (see below), whose sum is σ = 31558772. Its totient is φ = 26101020.

The previous prime is 28711237. The next prime is 28711279. The reversal of 28711243 is 34211782.

It is not a de Polignac number, because 28711243 - 2⁵ = 28711211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28711043) 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 5 ways as a sum of consecutive naturals, for example, 118521 + ... + 118762.

Almost surely, 2^28711243 is an apocalyptic number.

28711243 is a deficient number, since it is larger than the sum of its proper divisors (2847529).

28711243 is a wasteful number, since it uses less digits than its factorization.

28711243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237305 (or 237294 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 28711243 is about 5358.2873196573. The cubic root of 28711243 is about 306.2085631567.

It can be divided in two parts, 2871 and 1243, that multiplied together give a palindrome (3568653).

The spelling of 28711243 in words is "twenty-eight million, seven hundred eleven thousand, two hundred forty-three".