780768731 has 2 divisors, whose sum is σ = 780768732. Its totient is φ = 780768730.

The previous prime is 780768701. The next prime is 780768733. The reversal of 780768731 is 137867087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 780768731 - 2¹⁴ = 780752347 is a prime.

It is a super-2 number, since 2×780768731² = 1219199622614700722, which contains 22 as substring.

Together with 780768733, 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 (780768733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390384365 + 390384366.

It is an arithmetic number, because the mean of its divisors is an integer number (390384366).

Almost surely, 2^780768731 is an apocalyptic number.

780768731 is a deficient number, since it is larger than the sum of its proper divisors (1).

780768731 is an equidigital number, since it uses as much as digits as its factorization.

780768731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 780768731 is about 27942.2391908737. The cubic root of 780768731 is about 920.8187147292.

The spelling of 780768731 in words is "seven hundred eighty million, seven hundred sixty-eight thousand, seven hundred thirty-one".