78616579 has 2 divisors, whose sum is σ = 78616580. Its totient is φ = 78616578.

The previous prime is 78616561. The next prime is 78616583. The reversal of 78616579 is 97561687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78616579 - 2¹¹ = 78614531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78616519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39308289 + 39308290.

It is an arithmetic number, because the mean of its divisors is an integer number (39308290).

Almost surely, 2^78616579 is an apocalyptic number.

78616579 is a deficient number, since it is larger than the sum of its proper divisors (1).

78616579 is an equidigital number, since it uses as much as digits as its factorization.

78616579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 78616579 is about 8866.5990661583. The cubic root of 78616579 is about 428.3887401094.

The spelling of 78616579 in words is "seventy-eight million, six hundred sixteen thousand, five hundred seventy-nine".