78768289 has 2 divisors, whose sum is σ = 78768290. Its totient is φ = 78768288.

The previous prime is 78768271. The next prime is 78768317. The reversal of 78768289 is 98286787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70006689 + 8761600 = 8367^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 78768289 - 2⁷ = 78768161 is a prime.

It is not a weakly prime, because it can be changed into another prime (78748289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39384144 + 39384145.

It is an arithmetic number, because the mean of its divisors is an integer number (39384145).

Almost surely, 2^78768289 is an apocalyptic number.

It is an amenable number.

78768289 is a deficient number, since it is larger than the sum of its proper divisors (1).

78768289 is an equidigital number, since it uses as much as digits as its factorization.

78768289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The square root of 78768289 is about 8875.1500832380. The cubic root of 78768289 is about 428.6641234788.

The spelling of 78768289 in words is "seventy-eight million, seven hundred sixty-eight thousand, two hundred eighty-nine".