78964446787 has 2 divisors, whose sum is σ = 78964446788. Its totient is φ = 78964446786.

The previous prime is 78964446779. The next prime is 78964446839. The reversal of 78964446787 is 78764446987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78964446787 - 2³ = 78964446779 is a prime.

It is not a weakly prime, because it can be changed into another prime (78964440787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39482223393 + 39482223394.

It is an arithmetic number, because the mean of its divisors is an integer number (39482223394).

Almost surely, 2^78964446787 is an apocalyptic number.

78964446787 is a deficient number, since it is larger than the sum of its proper divisors (1).

78964446787 is an equidigital number, since it uses as much as digits as its factorization.

78964446787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 455196672, while the sum is 70.

The spelling of 78964446787 in words is "seventy-eight billion, nine hundred sixty-four million, four hundred forty-six thousand, seven hundred eighty-seven".