767678321 has 2 divisors, whose sum is σ = 767678322. Its totient is φ = 767678320.

The previous prime is 767678287. The next prime is 767678339. The reversal of 767678321 is 123876767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689797696 + 77880625 = 26264^2 + 8825^2 .

It is a cyclic number.

It is not a de Polignac number, because 767678321 - 2²² = 763484017 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (767378321) 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, 383839160 + 383839161.

It is an arithmetic number, because the mean of its divisors is an integer number (383839161).

Almost surely, 2^767678321 is an apocalyptic number.

It is an amenable number.

767678321 is a deficient number, since it is larger than the sum of its proper divisors (1).

767678321 is an equidigital number, since it uses as much as digits as its factorization.

767678321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 47.

The square root of 767678321 is about 27707.0085177018. The cubic root of 767678321 is about 915.6435183634.

The spelling of 767678321 in words is "seven hundred sixty-seven million, six hundred seventy-eight thousand, three hundred twenty-one".