780320771 has 2 divisors, whose sum is σ = 780320772. Its totient is φ = 780320770.

The previous prime is 780320741. The next prime is 780320773. The reversal of 780320771 is 177023087.

It is a strong prime.

It is an emirp because it is prime and its reverse (177023087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780320771 - 2¹⁸ = 780058627 is a prime.

Together with 780320773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (780320773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390160385 + 390160386.

It is an arithmetic number, because the mean of its divisors is an integer number (390160386).

Almost surely, 2^780320771 is an apocalyptic number.

780320771 is a deficient number, since it is larger than the sum of its proper divisors (1).

780320771 is an equidigital number, since it uses as much as digits as its factorization.

780320771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 780320771 is about 27934.2222193495. Note that the first 4 decimals coincide. The cubic root of 780320771 is about 920.6425768419.

The spelling of 780320771 in words is "seven hundred eighty million, three hundred twenty thousand, seven hundred seventy-one".