78806297 has 2 divisors, whose sum is σ = 78806298. Its totient is φ = 78806296.

The previous prime is 78806279. The next prime is 78806323. The reversal of 78806297 is 79260887.

Together with previous prime (78806279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58049161 + 20757136 = 7619^2 + 4556^2 .

It is an emirp because it is prime and its reverse (79260887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78806297 - 2¹⁴ = 78789913 is a prime.

It is not a weakly prime, because it can be changed into another prime (78806267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403148 + 39403149.

It is an arithmetic number, because the mean of its divisors is an integer number (39403149).

Almost surely, 2^78806297 is an apocalyptic number.

It is an amenable number.

78806297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78806297 is an equidigital number, since it uses as much as digits as its factorization.

78806297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 78806297 is about 8877.2910845595. The cubic root of 78806297 is about 428.7330600452.

The spelling of 78806297 in words is "seventy-eight million, eight hundred six thousand, two hundred ninety-seven".