78844841 has 2 divisors, whose sum is σ = 78844842. Its totient is φ = 78844840.

The previous prime is 78844807. The next prime is 78844847. The reversal of 78844841 is 14844887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 30250000 = 6971^2 + 5500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78844841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78844792 and 78844801.

It is not a weakly prime, because it can be changed into another prime (78844847) 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, 39422420 + 39422421.

It is an arithmetic number, because the mean of its divisors is an integer number (39422421).

Almost surely, 2^78844841 is an apocalyptic number.

It is an amenable number.

78844841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78844841 is an equidigital number, since it uses as much as digits as its factorization.

78844841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229376, while the sum is 44.

The square root of 78844841 is about 8879.4617517054. The cubic root of 78844841 is about 428.8029461427.

The spelling of 78844841 in words is "seventy-eight million, eight hundred forty-four thousand, eight hundred forty-one".