28280687 has 2 divisors, whose sum is σ = 28280688. Its totient is φ = 28280686.

The previous prime is 28280669. The next prime is 28280701. The reversal of 28280687 is 78608282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28280687 - 2⁸ = 28280431 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 (28289687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140343 + 14140344.

It is an arithmetic number, because the mean of its divisors is an integer number (14140344).

Almost surely, 2^28280687 is an apocalyptic number.

28280687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280687 is an equidigital number, since it uses as much as digits as its factorization.

28280687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28280687 is about 5317.9589129665. The cubic root of 28280687 is about 304.6702052002.

The spelling of 28280687 in words is "twenty-eight million, two hundred eighty thousand, six hundred eighty-seven".