78448313 has 2 divisors, whose sum is σ = 78448314. Its totient is φ = 78448312.

The previous prime is 78448309. The next prime is 78448327. The reversal of 78448313 is 31384487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64513024 + 13935289 = 8032^2 + 3733^2 .

It is an emirp because it is prime and its reverse (31384487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78448313 - 2² = 78448309 is a prime.

It is not a weakly prime, because it can be changed into another prime (78448303) 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, 39224156 + 39224157.

It is an arithmetic number, because the mean of its divisors is an integer number (39224157).

Almost surely, 2^78448313 is an apocalyptic number.

It is an amenable number.

78448313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78448313 is an equidigital number, since it uses as much as digits as its factorization.

78448313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 78448313 is about 8857.1052268786. The cubic root of 78448313 is about 428.0828896582.

The spelling of 78448313 in words is "seventy-eight million, four hundred forty-eight thousand, three hundred thirteen".