768643 has 2 divisors, whose sum is σ = 768644. Its totient is φ = 768642.

The previous prime is 768641. The next prime is 768653. The reversal of 768643 is 346867.

It is a weak prime.

It is an emirp because it is prime and its reverse (346867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 768643 - 2¹ = 768641 is a prime.

It is a super-2 number, since 2×768643² = 1181624122898, which contains 22 as substring.

Together with 768641, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 768599 and 768608.

It is not a weakly prime, because it can be changed into another prime (768641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384321 + 384322.

It is an arithmetic number, because the mean of its divisors is an integer number (384322).

768643 is a Friedman number, since it can be written as 8^6*4-6^7+3, using all its digits and the basic arithmetic operations.

2⁷⁶⁸⁶⁴³ is an apocalyptic number.

768643 is a deficient number, since it is larger than the sum of its proper divisors (1).

768643 is an equidigital number, since it uses as much as digits as its factorization.

768643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 768643 is about 876.7228752576. The cubic root of 768643 is about 91.6026896104.

It can be divided in two parts, 76864 and 3, that added together give a palindrome (76867).

The spelling of 768643 in words is "seven hundred sixty-eight thousand, six hundred forty-three".