768221 has 2 divisors, whose sum is σ = 768222. Its totient is φ = 768220.

The previous prime is 768203. The next prime is 768241. The reversal of 768221 is 122867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 105625 = 814^2 + 325^2 .

It is an emirp because it is prime and its reverse (122867) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384110 + 384111.

It is an arithmetic number, because the mean of its divisors is an integer number (384111).

2⁷⁶⁸²²¹ is an apocalyptic number.

It is an amenable number.

768221 is a deficient number, since it is larger than the sum of its proper divisors (1).

768221 is an equidigital number, since it uses as much as digits as its factorization.

768221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 768221 is about 876.4821732357. The cubic root of 768221 is about 91.5859226538.

It can be divided in two parts, 768 and 221, that added together give a palindrome (989).

The spelling of 768221 in words is "seven hundred sixty-eight thousand, two hundred twenty-one".