28258691 has 2 divisors, whose sum is σ = 28258692. Its totient is φ = 28258690.

The previous prime is 28258669. The next prime is 28258693. The reversal of 28258691 is 19685282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28258691 - 2⁶ = 28258627 is a prime.

Together with 28258693, 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 (28258693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129345 + 14129346.

It is an arithmetic number, because the mean of its divisors is an integer number (14129346).

Almost surely, 2^28258691 is an apocalyptic number.

28258691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258691 is an equidigital number, since it uses as much as digits as its factorization.

28258691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 28258691 is about 5315.8904240024. The cubic root of 28258691 is about 304.5911964641.

The spelling of 28258691 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred ninety-one".