78086089 has 2 divisors, whose sum is σ = 78086090. Its totient is φ = 78086088.

The previous prime is 78086059. The next prime is 78086093. The reversal of 78086089 is 98068087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42146064 + 35940025 = 6492^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 78086089 - 2¹⁵ = 78053321 is a prime.

It is not a weakly prime, because it can be changed into another prime (78086059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39043044 + 39043045.

It is an arithmetic number, because the mean of its divisors is an integer number (39043045).

Almost surely, 2^78086089 is an apocalyptic number.

It is an amenable number.

78086089 is a deficient number, since it is larger than the sum of its proper divisors (1).

78086089 is an equidigital number, since it uses as much as digits as its factorization.

78086089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 78086089 is about 8836.6333521313. The cubic root of 78086089 is about 427.4230022173.

The spelling of 78086089 in words is "seventy-eight million, eighty-six thousand, eighty-nine".