28658687 has 2 divisors, whose sum is σ = 28658688. Its totient is φ = 28658686.

The previous prime is 28658681. The next prime is 28658689. The reversal of 28658687 is 78685682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28658687 - 2⁸ = 28658431 is a prime.

Together with 28658689, 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 (28658681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14329343 + 14329344.

It is an arithmetic number, because the mean of its divisors is an integer number (14329344).

Almost surely, 2^28658687 is an apocalyptic number.

28658687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28658687 is an equidigital number, since it uses as much as digits as its factorization.

28658687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 28658687 is about 5353.3808943508. The cubic root of 28658687 is about 306.0216105318.

The spelling of 28658687 in words is "twenty-eight million, six hundred fifty-eight thousand, six hundred eighty-seven".