78327760289 has 2 divisors, whose sum is σ = 78327760290. Its totient is φ = 78327760288.

The previous prime is 78327760271. The next prime is 78327760307. The reversal of 78327760289 is 98206772387.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (78327760271) and next prime (78327760307).

It can be written as a sum of positive squares in only one way, i.e., 65033670289 + 13294090000 = 255017^2 + 115300^2 .

It is a cyclic number.

It is not a de Polignac number, because 78327760289 - 2²⁰ = 78326711713 is a prime.

It is a super-2 number, since 2×78327760289² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78327760789) 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, 39163880144 + 39163880145.

It is an arithmetic number, because the mean of its divisors is an integer number (39163880145).

Almost surely, 2^78327760289 is an apocalyptic number.

It is an amenable number.

78327760289 is a deficient number, since it is larger than the sum of its proper divisors (1).

78327760289 is an equidigital number, since it uses as much as digits as its factorization.

78327760289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 78327760289 in words is "seventy-eight billion, three hundred twenty-seven million, seven hundred sixty thousand, two hundred eighty-nine".