28086257 has 2 divisors, whose sum is σ = 28086258. Its totient is φ = 28086256.

The previous prime is 28086241. The next prime is 28086281. The reversal of 28086257 is 75268082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27133681 + 952576 = 5209^2 + 976^2 .

It is a cyclic number.

It is not a de Polignac number, because 28086257 - 2⁴ = 28086241 is a prime.

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 28086257.

It is not a weakly prime, because it can be changed into another prime (28086857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14043128 + 14043129.

It is an arithmetic number, because the mean of its divisors is an integer number (14043129).

Almost surely, 2^28086257 is an apocalyptic number.

It is an amenable number.

28086257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28086257 is an equidigital number, since it uses as much as digits as its factorization.

28086257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 28086257 is about 5299.6468750286. The cubic root of 28086257 is about 303.9703954608.

The spelling of 28086257 in words is "twenty-eight million, eighty-six thousand, two hundred fifty-seven".