78755791 has 2 divisors, whose sum is σ = 78755792. Its totient is φ = 78755790.

The previous prime is 78755777. The next prime is 78755839. The reversal of 78755791 is 19755787.

It is a weak prime.

It is an emirp because it is prime and its reverse (19755787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78755791 - 2⁹ = 78755279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78755701) 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, 39377895 + 39377896.

It is an arithmetic number, because the mean of its divisors is an integer number (39377896).

Almost surely, 2^78755791 is an apocalyptic number.

78755791 is a deficient number, since it is larger than the sum of its proper divisors (1).

78755791 is an equidigital number, since it uses as much as digits as its factorization.

78755791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 617400, while the sum is 49.

The square root of 78755791 is about 8874.4459545371. The cubic root of 78755791 is about 428.6414505324.

The spelling of 78755791 in words is "seventy-eight million, seven hundred fifty-five thousand, seven hundred ninety-one".