28251907 has 2 divisors, whose sum is σ = 28251908. Its totient is φ = 28251906.

The previous prime is 28251877. The next prime is 28251953. The reversal of 28251907 is 70915282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28251907 - 2¹⁹ = 27727619 is a prime.

It is not a weakly prime, because it can be changed into another prime (28251007) 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, 14125953 + 14125954.

It is an arithmetic number, because the mean of its divisors is an integer number (14125954).

Almost surely, 2^28251907 is an apocalyptic number.

28251907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28251907 is an equidigital number, since it uses as much as digits as its factorization.

28251907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28251907 is about 5315.2522988095. The cubic root of 28251907 is about 304.5668203403.

The spelling of 28251907 in words is "twenty-eight million, two hundred fifty-one thousand, nine hundred seven".