78080309 has 2 divisors, whose sum is σ = 78080310. Its totient is φ = 78080308.

The previous prime is 78080287. The next prime is 78080357. The reversal of 78080309 is 90308087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 4635409 = 8570^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 78080309 - 2¹⁶ = 78014773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78080369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39040154 + 39040155.

It is an arithmetic number, because the mean of its divisors is an integer number (39040155).

Almost surely, 2^78080309 is an apocalyptic number.

It is an amenable number.

78080309 is a deficient number, since it is larger than the sum of its proper divisors (1).

78080309 is an equidigital number, since it uses as much as digits as its factorization.

78080309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 78080309 is about 8836.3062984485. The cubic root of 78080309 is about 427.4124558834.

The spelling of 78080309 in words is "seventy-eight million, eighty thousand, three hundred nine".