78957793 has 2 divisors, whose sum is σ = 78957794. Its totient is φ = 78957792.

The previous prime is 78957773. The next prime is 78957799. The reversal of 78957793 is 39775987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77651344 + 1306449 = 8812^2 + 1143^2 .

It is a cyclic number.

It is not a de Polignac number, because 78957793 - 2²⁵ = 45403361 is a prime.

It is not a weakly prime, because it can be changed into another prime (78957799) 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, 39478896 + 39478897.

It is an arithmetic number, because the mean of its divisors is an integer number (39478897).

Almost surely, 2^78957793 is an apocalyptic number.

It is an amenable number.

78957793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78957793 is an equidigital number, since it uses as much as digits as its factorization.

78957793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3333960, while the sum is 55.

The square root of 78957793 is about 8885.8197708484. The cubic root of 78957793 is about 429.0076141102.

The spelling of 78957793 in words is "seventy-eight million, nine hundred fifty-seven thousand, seven hundred ninety-three".