28688087 has 2 divisors, whose sum is σ = 28688088. Its totient is φ = 28688086.

The previous prime is 28688063. The next prime is 28688089. The reversal of 28688087 is 78088682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28688087 is a prime.

Together with 28688089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28688089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14344043 + 14344044.

It is an arithmetic number, because the mean of its divisors is an integer number (14344044).

Almost surely, 2^28688087 is an apocalyptic number.

28688087 is a deficient number, since it is larger than the sum of its proper divisors (1).

28688087 is an equidigital number, since it uses as much as digits as its factorization.

28688087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 344064, while the sum is 47.

The square root of 28688087 is about 5356.1261187541. The cubic root of 28688087 is about 306.1262205873.

The spelling of 28688087 in words is "twenty-eight million, six hundred eighty-eight thousand, eighty-seven".