78565793 has 2 divisors, whose sum is σ = 78565794. Its totient is φ = 78565792.

The previous prime is 78565777. The next prime is 78565807. The reversal of 78565793 is 39756587.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41319184 + 37246609 = 6428^2 + 6103^2 .

It is a cyclic number.

It is not a de Polignac number, because 78565793 - 2⁴ = 78565777 is a prime.

It is not a weakly prime, because it can be changed into another prime (78565093) 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, 39282896 + 39282897.

It is an arithmetic number, because the mean of its divisors is an integer number (39282897).

Almost surely, 2^78565793 is an apocalyptic number.

It is an amenable number.

78565793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78565793 is an equidigital number, since it uses as much as digits as its factorization.

78565793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 50.

The square root of 78565793 is about 8863.7347094777. The cubic root of 78565793 is about 428.2964744266.

The spelling of 78565793 in words is "seventy-eight million, five hundred sixty-five thousand, seven hundred ninety-three".