78447667 has 2 divisors, whose sum is σ = 78447668. Its totient is φ = 78447666.

The previous prime is 78447623. The next prime is 78447679. The reversal of 78447667 is 76674487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78447667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78447667.

It is not a weakly prime, because it can be changed into another prime (78447767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39223833 + 39223834.

It is an arithmetic number, because the mean of its divisors is an integer number (39223834).

Almost surely, 2^78447667 is an apocalyptic number.

78447667 is a deficient number, since it is larger than the sum of its proper divisors (1).

78447667 is an equidigital number, since it uses as much as digits as its factorization.

78447667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 49.

The square root of 78447667 is about 8857.0687589066. The cubic root of 78447667 is about 428.0817146072.

The spelling of 78447667 in words is "seventy-eight million, four hundred forty-seven thousand, six hundred sixty-seven".