78868897 has 2 divisors, whose sum is σ = 78868898. Its totient is φ = 78868896.

The previous prime is 78868883. The next prime is 78868901. The reversal of 78868897 is 79886887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 1147041 = 8816^2 + 1071^2 .

It is a cyclic number.

It is not a de Polignac number, because 78868897 - 2¹⁵ = 78836129 is a prime.

It is not a weakly prime, because it can be changed into another prime (78868807) 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, 39434448 + 39434449.

It is an arithmetic number, because the mean of its divisors is an integer number (39434449).

Almost surely, 2^78868897 is an apocalyptic number.

It is an amenable number.

78868897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78868897 is an equidigital number, since it uses as much as digits as its factorization.

78868897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 61.

The square root of 78868897 is about 8880.8162350090. The cubic root of 78868897 is about 428.8465517637.

The spelling of 78868897 in words is "seventy-eight million, eight hundred sixty-eight thousand, eight hundred ninety-seven".