28089911 has 2 divisors, whose sum is σ = 28089912. Its totient is φ = 28089910.

The previous prime is 28089907. The next prime is 28089917. The reversal of 28089911 is 11998082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28089911 - 2² = 28089907 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28089917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14044955 + 14044956.

It is an arithmetic number, because the mean of its divisors is an integer number (14044956).

Almost surely, 2^28089911 is an apocalyptic number.

28089911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28089911 is an equidigital number, since it uses as much as digits as its factorization.

28089911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 28089911 is about 5299.9916037669. The cubic root of 28089911 is about 303.9835769925.

The spelling of 28089911 in words is "twenty-eight million, eighty-nine thousand, nine hundred eleven".