78564371 has 2 divisors, whose sum is σ = 78564372. Its totient is φ = 78564370.

The previous prime is 78564349. The next prime is 78564379. The reversal of 78564371 is 17346587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78564371 - 2¹⁸ = 78302227 is a prime.

It is not a weakly prime, because it can be changed into another prime (78564379) 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, 39282185 + 39282186.

It is an arithmetic number, because the mean of its divisors is an integer number (39282186).

Almost surely, 2^78564371 is an apocalyptic number.

78564371 is a deficient number, since it is larger than the sum of its proper divisors (1).

78564371 is an equidigital number, since it uses as much as digits as its factorization.

78564371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 78564371 is about 8863.6544946202. The cubic root of 78564371 is about 428.2938904298.

It can be divided in two parts, 785 and 64371, that added together give a palindrome (65156).

The spelling of 78564371 in words is "seventy-eight million, five hundred sixty-four thousand, three hundred seventy-one".