768897391 has 2 divisors, whose sum is σ = 768897392. Its totient is φ = 768897390.

The previous prime is 768897373. The next prime is 768897397. The reversal of 768897391 is 193798867.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 768897391 - 2⁹ = 768896879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768897397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384448695 + 384448696.

It is an arithmetic number, because the mean of its divisors is an integer number (384448696).

Almost surely, 2^768897391 is an apocalyptic number.

768897391 is a deficient number, since it is larger than the sum of its proper divisors (1).

768897391 is an equidigital number, since it uses as much as digits as its factorization.

768897391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 768897391 is about 27728.9990984168. Note that the first 3 decimals coincide. The cubic root of 768897391 is about 916.1279414071.

The spelling of 768897391 in words is "seven hundred sixty-eight million, eight hundred ninety-seven thousand, three hundred ninety-one".