78944429 has 2 divisors, whose sum is σ = 78944430. Its totient is φ = 78944428.

The previous prime is 78944387. The next prime is 78944477. The reversal of 78944429 is 92444987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69272329 + 9672100 = 8323^2 + 3110^2 .

It is an emirp because it is prime and its reverse (92444987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78944429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78944029) 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, 39472214 + 39472215.

It is an arithmetic number, because the mean of its divisors is an integer number (39472215).

Almost surely, 2^78944429 is an apocalyptic number.

It is an amenable number.

78944429 is a deficient number, since it is larger than the sum of its proper divisors (1).

78944429 is an equidigital number, since it uses as much as digits as its factorization.

78944429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 78944429 is about 8885.0677543843. The cubic root of 78944429 is about 428.9834088523.

The spelling of 78944429 in words is "seventy-eight million, nine hundred forty-four thousand, four hundred twenty-nine".