28256687 has 2 divisors, whose sum is σ = 28256688. Its totient is φ = 28256686.

The previous prime is 28256677. The next prime is 28256713. The reversal of 28256687 is 78665282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28256687 - 2⁶ = 28256623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28256677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128343 + 14128344.

It is an arithmetic number, because the mean of its divisors is an integer number (14128344).

Almost surely, 2^28256687 is an apocalyptic number.

28256687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28256687 is an equidigital number, since it uses as much as digits as its factorization.

28256687 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 28256687 is about 5315.7019291905. The cubic root of 28256687 is about 304.5839961402.

The spelling of 28256687 in words is "twenty-eight million, two hundred fifty-six thousand, six hundred eighty-seven".