28158308999 has 2 divisors, whose sum is σ = 28158309000. Its totient is φ = 28158308998.

The previous prime is 28158308977. The next prime is 28158309007. The reversal of 28158308999 is 99980385182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28158308999 - 2⁸ = 28158308743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28158308099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14079154499 + 14079154500.

It is an arithmetic number, because the mean of its divisors is an integer number (14079154500).

Almost surely, 2^28158308999 is an apocalyptic number.

28158308999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28158308999 is an equidigital number, since it uses as much as digits as its factorization.

28158308999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 62.

The spelling of 28158308999 in words is "twenty-eight billion, one hundred fifty-eight million, three hundred eight thousand, nine hundred ninety-nine".