78668041 has 2 divisors, whose sum is σ = 78668042. Its totient is φ = 78668040.

The previous prime is 78668033. The next prime is 78668047. The reversal of 78668041 is 14086687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 37258816 = 6435^2 + 6104^2 .

It is a cyclic number.

It is not a de Polignac number, because 78668041 - 2³ = 78668033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78667985 and 78668003.

It is not a weakly prime, because it can be changed into another prime (78668047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334020 + 39334021.

It is an arithmetic number, because the mean of its divisors is an integer number (39334021).

Almost surely, 2^78668041 is an apocalyptic number.

It is an amenable number.

78668041 is a deficient number, since it is larger than the sum of its proper divisors (1).

78668041 is an equidigital number, since it uses as much as digits as its factorization.

78668041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78668041 is about 8869.5006060093. The cubic root of 78668041 is about 428.4821933947.

The spelling of 78668041 in words is "seventy-eight million, six hundred sixty-eight thousand, forty-one".