28380211 has 2 divisors, whose sum is σ = 28380212. Its totient is φ = 28380210.

The previous prime is 28380203. The next prime is 28380223. The reversal of 28380211 is 11208382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28380211 - 2³ = 28380203 is a prime.

It is not a weakly prime, because it can be changed into another prime (28380251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190105 + 14190106.

It is an arithmetic number, because the mean of its divisors is an integer number (14190106).

Almost surely, 2^28380211 is an apocalyptic number.

28380211 is a deficient number, since it is larger than the sum of its proper divisors (1).

28380211 is an equidigital number, since it uses as much as digits as its factorization.

28380211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28380211 is about 5327.3080444067. The cubic root of 28380211 is about 305.0271802347.

Adding to 28380211 its reverse (11208382), we get a palindrome (39588593).

The spelling of 28380211 in words is "twenty-eight million, three hundred eighty thousand, two hundred eleven".