768429721 has 2 divisors, whose sum is σ = 768429722. Its totient is φ = 768429720.

The previous prime is 768429703. The next prime is 768429751. The reversal of 768429721 is 127924867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 750486025 + 17943696 = 27395^2 + 4236^2 .

It is a cyclic number.

It is not a de Polignac number, because 768429721 - 2⁵ = 768429689 is a prime.

It is a super-2 number, since 2×768429721² = 1180968472232275682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (768429751) 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, 384214860 + 384214861.

It is an arithmetic number, because the mean of its divisors is an integer number (384214861).

Almost surely, 2^768429721 is an apocalyptic number.

It is an amenable number.

768429721 is a deficient number, since it is larger than the sum of its proper divisors (1).

768429721 is an equidigital number, since it uses as much as digits as its factorization.

768429721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 768429721 is about 27720.5649473455. The cubic root of 768429721 is about 915.9421634980.

The spelling of 768429721 in words is "seven hundred sixty-eight million, four hundred twenty-nine thousand, seven hundred twenty-one".