28549907 has 2 divisors, whose sum is σ = 28549908. Its totient is φ = 28549906.

The previous prime is 28549901. The next prime is 28549909. The reversal of 28549907 is 70994582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28549907 - 2¹⁶ = 28484371 is a prime.

Together with 28549909, 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 (28549901) 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, 14274953 + 14274954.

It is an arithmetic number, because the mean of its divisors is an integer number (14274954).

Almost surely, 2^28549907 is an apocalyptic number.

28549907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28549907 is an equidigital number, since it uses as much as digits as its factorization.

28549907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 28549907 is about 5343.2113003324. The cubic root of 28549907 is about 305.6339300784.

The spelling of 28549907 in words is "twenty-eight million, five hundred forty-nine thousand, nine hundred seven".