78789898489 has 2 divisors, whose sum is σ = 78789898490. Its totient is φ = 78789898488.

The previous prime is 78789898471. The next prime is 78789898511. The reversal of 78789898489 is 98489898787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78736360000 + 53538489 = 280600^2 + 7317^2 .

It is a cyclic number.

It is not a de Polignac number, because 78789898489 - 2⁷ = 78789898361 is a prime.

It is not a weakly prime, because it can be changed into another prime (78789895489) 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, 39394949244 + 39394949245.

It is an arithmetic number, because the mean of its divisors is an integer number (39394949245).

Almost surely, 2^78789898489 is an apocalyptic number.

It is an amenable number.

78789898489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78789898489 is an equidigital number, since it uses as much as digits as its factorization.

78789898489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4682022912, while the sum is 85.

The spelling of 78789898489 in words is "seventy-eight billion, seven hundred eighty-nine million, eight hundred ninety-eight thousand, four hundred eighty-nine".