78612319 has 2 divisors, whose sum is σ = 78612320. Its totient is φ = 78612318.

The previous prime is 78612283. The next prime is 78612377. The reversal of 78612319 is 91321687.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78612319 is a prime.

It is a super-2 number, since 2×78612319² = 12359793397115522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78612019) 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, 39306159 + 39306160.

It is an arithmetic number, because the mean of its divisors is an integer number (39306160).

Almost surely, 2^78612319 is an apocalyptic number.

78612319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78612319 is an equidigital number, since it uses as much as digits as its factorization.

78612319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 78612319 is about 8866.3588355085. The cubic root of 78612319 is about 428.3810022632.

The spelling of 78612319 in words is "seventy-eight million, six hundred twelve thousand, three hundred nineteen".