28121267 has 2 divisors, whose sum is σ = 28121268. Its totient is φ = 28121266.

The previous prime is 28121263. The next prime is 28121321. The reversal of 28121267 is 76212182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28121267 - 2² = 28121263 is a prime.

It is not a weakly prime, because it can be changed into another prime (28121263) 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, 14060633 + 14060634.

It is an arithmetic number, because the mean of its divisors is an integer number (14060634).

Almost surely, 2^28121267 is an apocalyptic number.

28121267 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121267 is an equidigital number, since it uses as much as digits as its factorization.

28121267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 28121267 is about 5302.9488966046. The cubic root of 28121267 is about 304.0966444515.

The spelling of 28121267 in words is "twenty-eight million, one hundred twenty-one thousand, two hundred sixty-seven".