28084012091 has 2 divisors, whose sum is σ = 28084012092. Its totient is φ = 28084012090.

The previous prime is 28084012057. The next prime is 28084012097. The reversal of 28084012091 is 19021048082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28084012091 - 2⁶ = 28084012027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28084012097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14042006045 + 14042006046.

It is an arithmetic number, because the mean of its divisors is an integer number (14042006046).

Almost surely, 2^28084012091 is an apocalyptic number.

28084012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28084012091 is an equidigital number, since it uses as much as digits as its factorization.

28084012091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 28084012091 in words is "twenty-eight billion, eighty-four million, twelve thousand, ninety-one".