78057913 has 2 divisors, whose sum is σ = 78057914. Its totient is φ = 78057912.

The previous prime is 78057911. The next prime is 78057919. The reversal of 78057913 is 31975087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 2663424 = 8683^2 + 1632^2 .

It is a cyclic number.

It is not a de Polignac number, because 78057913 - 2¹ = 78057911 is a prime.

Together with 78057911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78057911) 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, 39028956 + 39028957.

It is an arithmetic number, because the mean of its divisors is an integer number (39028957).

Almost surely, 2^78057913 is an apocalyptic number.

It is an amenable number.

78057913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78057913 is an equidigital number, since it uses as much as digits as its factorization.

78057913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 78057913 is about 8835.0389359640. The cubic root of 78057913 is about 427.3715866602.

The spelling of 78057913 in words is "seventy-eight million, fifty-seven thousand, nine hundred thirteen".