78318619 has 2 divisors, whose sum is σ = 78318620. Its totient is φ = 78318618.

The previous prime is 78318563. The next prime is 78318637. The reversal of 78318619 is 91681387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78318619 - 2¹⁷ = 78187547 is a prime.

It is a super-2 number, since 2×78318619² = 12267612164134322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78318649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39159309 + 39159310.

It is an arithmetic number, because the mean of its divisors is an integer number (39159310).

Almost surely, 2^78318619 is an apocalyptic number.

78318619 is a deficient number, since it is larger than the sum of its proper divisors (1).

78318619 is an equidigital number, since it uses as much as digits as its factorization.

78318619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 78318619 is about 8849.7807317470. The cubic root of 78318619 is about 427.8468514136.

The spelling of 78318619 in words is "seventy-eight million, three hundred eighteen thousand, six hundred nineteen".