28075231 has 2 divisors, whose sum is σ = 28075232. Its totient is φ = 28075230.

The previous prime is 28075207. The next prime is 28075241. The reversal of 28075231 is 13257082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28075231 - 2⁵ = 28075199 is a prime.

It is a super-2 number, since 2×28075231² = 1576437191406722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28075231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28075241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14037615 + 14037616.

It is an arithmetic number, because the mean of its divisors is an integer number (14037616).

Almost surely, 2^28075231 is an apocalyptic number.

28075231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28075231 is an equidigital number, since it uses as much as digits as its factorization.

28075231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28075231 is about 5298.6065149245. The cubic root of 28075231 is about 303.9306130593.

The spelling of 28075231 in words is "twenty-eight million, seventy-five thousand, two hundred thirty-one".