28243907 has 2 divisors, whose sum is σ = 28243908. Its totient is φ = 28243906.

The previous prime is 28243903. The next prime is 28243909. The reversal of 28243907 is 70934282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28243907 - 2² = 28243903 is a prime.

Together with 28243909, 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 (28243903) 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, 14121953 + 14121954.

It is an arithmetic number, because the mean of its divisors is an integer number (14121954).

Almost surely, 2^28243907 is an apocalyptic number.

28243907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243907 is an equidigital number, since it uses as much as digits as its factorization.

28243907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28243907 is about 5314.4996942328. The cubic root of 28243907 is about 304.5380698966.

The spelling of 28243907 in words is "twenty-eight million, two hundred forty-three thousand, nine hundred seven".