78818387 has 2 divisors, whose sum is σ = 78818388. Its totient is φ = 78818386.

The previous prime is 78818339. The next prime is 78818393. The reversal of 78818387 is 78381887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78818387 - 2⁶ = 78818323 is a prime.

It is not a weakly prime, because it can be changed into another prime (78818087) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39409193 + 39409194.

It is an arithmetic number, because the mean of its divisors is an integer number (39409194).

Almost surely, 2^78818387 is an apocalyptic number.

78818387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78818387 is an equidigital number, since it uses as much as digits as its factorization.

78818387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 50.

The square root of 78818387 is about 8877.9720094175. The cubic root of 78818387 is about 428.7549834948.

The spelling of 78818387 in words is "seventy-eight million, eight hundred eighteen thousand, three hundred eighty-seven".