28623211 has 2 divisors, whose sum is σ = 28623212. Its totient is φ = 28623210.

The previous prime is 28623209. The next prime is 28623269. The reversal of 28623211 is 11232682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28623211 - 2¹ = 28623209 is a prime.

Together with 28623209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28623911) 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, 14311605 + 14311606.

It is an arithmetic number, because the mean of its divisors is an integer number (14311606).

Almost surely, 2^28623211 is an apocalyptic number.

28623211 is a deficient number, since it is larger than the sum of its proper divisors (1).

28623211 is an equidigital number, since it uses as much as digits as its factorization.

28623211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 28623211 is about 5350.0664481855. The cubic root of 28623211 is about 305.8952857705.

Adding to 28623211 its reverse (11232682), we get a palindrome (39855893).

The spelling of 28623211 in words is "twenty-eight million, six hundred twenty-three thousand, two hundred eleven".