28843231 has 2 divisors, whose sum is σ = 28843232. Its totient is φ = 28843230.

The previous prime is 28843229. The next prime is 28843261. The reversal of 28843231 is 13234882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28843231 - 2¹ = 28843229 is a prime.

It is a super-2 number, since 2×28843231² = 1663863949038722, which contains 22 as substring.

Together with 28843229, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28843193 and 28843202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28843201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14421615 + 14421616.

It is an arithmetic number, because the mean of its divisors is an integer number (14421616).

Almost surely, 2^28843231 is an apocalyptic number.

28843231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28843231 is an equidigital number, since it uses as much as digits as its factorization.

28843231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 28843231 is about 5370.5894462340. The cubic root of 28843231 is about 306.6770681465.

The spelling of 28843231 in words is "twenty-eight million, eight hundred forty-three thousand, two hundred thirty-one".