28917211 has 2 divisors, whose sum is σ = 28917212. Its totient is φ = 28917210.

The previous prime is 28917197. The next prime is 28917241. The reversal of 28917211 is 11271982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28917211 - 2⁵ = 28917179 is a prime.

It is not a weakly prime, because it can be changed into another prime (28917241) 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, 14458605 + 14458606.

It is an arithmetic number, because the mean of its divisors is an integer number (14458606).

Almost surely, 2^28917211 is an apocalyptic number.

28917211 is a deficient number, since it is larger than the sum of its proper divisors (1).

28917211 is an equidigital number, since it uses as much as digits as its factorization.

28917211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The square root of 28917211 is about 5377.4725475822. The cubic root of 28917211 is about 306.9390429536.

The spelling of 28917211 in words is "twenty-eight million, nine hundred seventeen thousand, two hundred eleven".