78544667 has 2 divisors, whose sum is σ = 78544668. Its totient is φ = 78544666.

The previous prime is 78544621. The next prime is 78544679. The reversal of 78544667 is 76644587.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78544667 - 2⁶ = 78544603 is a prime.

It is not a weakly prime, because it can be changed into another prime (78544867) 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, 39272333 + 39272334.

It is an arithmetic number, because the mean of its divisors is an integer number (39272334).

Almost surely, 2^78544667 is an apocalyptic number.

78544667 is a deficient number, since it is larger than the sum of its proper divisors (1).

78544667 is an equidigital number, since it uses as much as digits as its factorization.

78544667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 47.

The square root of 78544667 is about 8862.5429195012. The cubic root of 78544667 is about 428.2580819655.

It can be divided in two parts, 7854 and 4667, that added together give a palindrome (12521).

The spelling of 78544667 in words is "seventy-eight million, five hundred forty-four thousand, six hundred sixty-seven".