78828089 has 2 divisors, whose sum is σ = 78828090. Its totient is φ = 78828088.

The previous prime is 78828053. The next prime is 78828091. The reversal of 78828089 is 98082887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75342400 + 3485689 = 8680^2 + 1867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78828089 is a prime.

Together with 78828091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78228089) 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, 39414044 + 39414045.

It is an arithmetic number, because the mean of its divisors is an integer number (39414045).

Almost surely, 2^78828089 is an apocalyptic number.

It is an amenable number.

78828089 is a deficient number, since it is larger than the sum of its proper divisors (1).

78828089 is an equidigital number, since it uses as much as digits as its factorization.

78828089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 78828089 is about 8878.5184011748. The cubic root of 78828089 is about 428.7725750338.

The spelling of 78828089 in words is "seventy-eight million, eight hundred twenty-eight thousand, eighty-nine".