78765319 has 2 divisors, whose sum is σ = 78765320. Its totient is φ = 78765318.

The previous prime is 78765287. The next prime is 78765347. The reversal of 78765319 is 91356787.

It is a strong prime.

It is an emirp because it is prime and its reverse (91356787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78765319 - 2⁵ = 78765287 is a prime.

It is a super-2 number, since 2×78765319² = 12407950954343522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78765359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39382659 + 39382660.

It is an arithmetic number, because the mean of its divisors is an integer number (39382660).

Almost surely, 2^78765319 is an apocalyptic number.

78765319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78765319 is an equidigital number, since it uses as much as digits as its factorization.

78765319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 78765319 is about 8874.9827605466. The cubic root of 78765319 is about 428.6587357420.

The spelling of 78765319 in words is "seventy-eight million, seven hundred sixty-five thousand, three hundred nineteen".