78647267 has 2 divisors, whose sum is σ = 78647268. Its totient is φ = 78647266.

The previous prime is 78647183. The next prime is 78647273. The reversal of 78647267 is 76274687.

It is a strong prime.

It is an emirp because it is prime and its reverse (76274687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78647267 - 2¹² = 78643171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78647297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39323633 + 39323634.

It is an arithmetic number, because the mean of its divisors is an integer number (39323634).

Almost surely, 2^78647267 is an apocalyptic number.

78647267 is a deficient number, since it is larger than the sum of its proper divisors (1).

78647267 is an equidigital number, since it uses as much as digits as its factorization.

78647267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 47.

The square root of 78647267 is about 8868.3294368218. The cubic root of 78647267 is about 428.4444734065. Note that the first 4 decimals are identical.

The spelling of 78647267 in words is "seventy-eight million, six hundred forty-seven thousand, two hundred sixty-seven".