78099089 has 2 divisors, whose sum is σ = 78099090. Its totient is φ = 78099088.

The previous prime is 78099083. The next prime is 78099097. The reversal of 78099089 is 98099087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 23116864 = 7415^2 + 4808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78099089 is a prime.

It is not a weakly prime, because it can be changed into another prime (78099083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39049544 + 39049545.

It is an arithmetic number, because the mean of its divisors is an integer number (39049545).

Almost surely, 2^78099089 is an apocalyptic number.

It is an amenable number.

78099089 is a deficient number, since it is larger than the sum of its proper divisors (1).

78099089 is an equidigital number, since it uses as much as digits as its factorization.

78099089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 78099089 is about 8837.3688957744. The cubic root of 78099089 is about 427.4467204441.

The spelling of 78099089 in words is "seventy-eight million, ninety-nine thousand, eighty-nine".