78888647 has 2 divisors, whose sum is σ = 78888648. Its totient is φ = 78888646.

The previous prime is 78888637. The next prime is 78888661. The reversal of 78888647 is 74688887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78888647 - 2⁴ = 78888631 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78888592 and 78888601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78888637) 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, 39444323 + 39444324.

It is an arithmetic number, because the mean of its divisors is an integer number (39444324).

Almost surely, 2^78888647 is an apocalyptic number.

78888647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888647 is an equidigital number, since it uses as much as digits as its factorization.

78888647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4816896, while the sum is 56.

The square root of 78888647 is about 8881.9281127467. The cubic root of 78888647 is about 428.8823453944.

The spelling of 78888647 in words is "seventy-eight million, eight hundred eighty-eight thousand, six hundred forty-seven".