78469619 has 2 divisors, whose sum is σ = 78469620. Its totient is φ = 78469618.

The previous prime is 78469591. The next prime is 78469661. The reversal of 78469619 is 91696487.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78469619 is a prime.

It is a super-2 number, since 2×78469619² = 12314962212010322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78469669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39234809 + 39234810.

It is an arithmetic number, because the mean of its divisors is an integer number (39234810).

Almost surely, 2^78469619 is an apocalyptic number.

78469619 is a deficient number, since it is larger than the sum of its proper divisors (1).

78469619 is an equidigital number, since it uses as much as digits as its factorization.

78469619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 78469619 is about 8858.3079083988. The cubic root of 78469619 is about 428.1216408993.

The spelling of 78469619 in words is "seventy-eight million, four hundred sixty-nine thousand, six hundred nineteen".