78729419 has 2 divisors, whose sum is σ = 78729420. Its totient is φ = 78729418.

The previous prime is 78729373. The next prime is 78729421. The reversal of 78729419 is 91492787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78729419 - 2²⁴ = 61952203 is a prime.

It is a super-2 number, since 2×78729419² = 12396642832155122, which contains 22 as substring.

Together with 78729421, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4599587 and since 78729419 and 4599587 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (78729439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39364709 + 39364710.

It is an arithmetic number, because the mean of its divisors is an integer number (39364710).

Almost surely, 2^78729419 is an apocalyptic number.

78729419 is a deficient number, since it is larger than the sum of its proper divisors (1).

78729419 is an equidigital number, since it uses as much as digits as its factorization.

78729419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 78729419 is about 8872.9599908937. The cubic root of 78729419 is about 428.5936005302.

The spelling of 78729419 in words is "seventy-eight million, seven hundred twenty-nine thousand, four hundred nineteen".