78034309 has 2 divisors, whose sum is σ = 78034310. Its totient is φ = 78034308.

The previous prime is 78034303. The next prime is 78034361. The reversal of 78034309 is 90343087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 7306209 = 8410^2 + 2703^2 .

It is an emirp because it is prime and its reverse (90343087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78034309 - 2⁵ = 78034277 is a prime.

It is a super-2 number, since 2×78034309² = 12178706762214962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78034303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39017154 + 39017155.

It is an arithmetic number, because the mean of its divisors is an integer number (39017155).

Almost surely, 2^78034309 is an apocalyptic number.

It is an amenable number.

78034309 is a deficient number, since it is larger than the sum of its proper divisors (1).

78034309 is an equidigital number, since it uses as much as digits as its factorization.

78034309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 78034309 is about 8833.7030174214. The cubic root of 78034309 is about 427.3285045625.

The spelling of 78034309 in words is "seventy-eight million, thirty-four thousand, three hundred nine".