78864697 has 2 divisors, whose sum is σ = 78864698. Its totient is φ = 78864696.

The previous prime is 78864647. The next prime is 78864701. The reversal of 78864697 is 79646887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77774761 + 1089936 = 8819^2 + 1044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78864697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78864647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432348 + 39432349.

It is an arithmetic number, because the mean of its divisors is an integer number (39432349).

Almost surely, 2^78864697 is an apocalyptic number.

It is an amenable number.

78864697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78864697 is an equidigital number, since it uses as much as digits as its factorization.

78864697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 55.

The square root of 78864697 is about 8880.5797671098. The cubic root of 78864697 is about 428.8389391832.

The spelling of 78864697 in words is "seventy-eight million, eight hundred sixty-four thousand, six hundred ninety-seven".