78844859 has 2 divisors, whose sum is σ = 78844860. Its totient is φ = 78844858.

The previous prime is 78844853. The next prime is 78844901. The reversal of 78844859 is 95844887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78844859 - 2²⁰ = 77796283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78844859.

It is not a weakly prime, because it can be changed into another prime (78844853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39422429 + 39422430.

It is an arithmetic number, because the mean of its divisors is an integer number (39422430).

Almost surely, 2^78844859 is an apocalyptic number.

78844859 is a deficient number, since it is larger than the sum of its proper divisors (1).

78844859 is an equidigital number, since it uses as much as digits as its factorization.

78844859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2580480, while the sum is 53.

The square root of 78844859 is about 8879.4627652803. The cubic root of 78844859 is about 428.8029787741.

The spelling of 78844859 in words is "seventy-eight million, eight hundred forty-four thousand, eight hundred fifty-nine".