28266857 has 2 divisors, whose sum is σ = 28266858. Its totient is φ = 28266856.

The previous prime is 28266829. The next prime is 28266859. The reversal of 28266857 is 75866282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27258841 + 1008016 = 5221^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 28266857 - 2¹⁰ = 28265833 is a prime.

Together with 28266859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28266859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14133428 + 14133429.

It is an arithmetic number, because the mean of its divisors is an integer number (14133429).

Almost surely, 2^28266857 is an apocalyptic number.

It is an amenable number.

28266857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28266857 is an equidigital number, since it uses as much as digits as its factorization.

28266857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 44.

The square root of 28266857 is about 5316.6584430448. The cubic root of 28266857 is about 304.6205331870.

The spelling of 28266857 in words is "twenty-eight million, two hundred sixty-six thousand, eight hundred fifty-seven".