28283231 has 2 divisors, whose sum is σ = 28283232. Its totient is φ = 28283230.

The previous prime is 28283209. The next prime is 28283263. The reversal of 28283231 is 13238282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28283231 - 2¹⁸ = 28021087 is a prime.

It is a super-2 number, since 2×28283231² = 1599882311598722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28283194 and 28283203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28283831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14141615 + 14141616.

It is an arithmetic number, because the mean of its divisors is an integer number (14141616).

Almost surely, 2^28283231 is an apocalyptic number.

28283231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28283231 is an equidigital number, since it uses as much as digits as its factorization.

28283231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 28283231 is about 5318.1980971002. The cubic root of 28283231 is about 304.6793405012.

The spelling of 28283231 in words is "twenty-eight million, two hundred eighty-three thousand, two hundred thirty-one".