78355349 has 2 divisors, whose sum is σ = 78355350. Its totient is φ = 78355348.

The previous prime is 78355309. The next prime is 78355391. The reversal of 78355349 is 94355387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77563249 + 792100 = 8807^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 78355349 - 2²⁰ = 77306773 is a prime.

It is a super-2 number, since 2×78355349² = 12279121433823602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78355309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39177674 + 39177675.

It is an arithmetic number, because the mean of its divisors is an integer number (39177675).

Almost surely, 2^78355349 is an apocalyptic number.

It is an amenable number.

78355349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78355349 is an equidigital number, since it uses as much as digits as its factorization.

78355349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 44.

The square root of 78355349 is about 8851.8556811552. The cubic root of 78355349 is about 427.9137250767.

The spelling of 78355349 in words is "seventy-eight million, three hundred fifty-five thousand, three hundred forty-nine".