78646049 has 2 divisors, whose sum is σ = 78646050. Its totient is φ = 78646048.

The previous prime is 78646021. The next prime is 78646067. The reversal of 78646049 is 94064687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 29084449 = 7040^2 + 5393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78646049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78640049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39323024 + 39323025.

It is an arithmetic number, because the mean of its divisors is an integer number (39323025).

Almost surely, 2^78646049 is an apocalyptic number.

It is an amenable number.

78646049 is a deficient number, since it is larger than the sum of its proper divisors (1).

78646049 is an equidigital number, since it uses as much as digits as its factorization.

78646049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 78646049 is about 8868.2607652234. The cubic root of 78646049 is about 428.4422616405.

The spelling of 78646049 in words is "seventy-eight million, six hundred forty-six thousand, forty-nine".