767681 has 2 divisors, whose sum is σ = 767682. Its totient is φ = 767680.

The previous prime is 767677. The next prime is 767707. The reversal of 767681 is 186767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512656 + 255025 = 716^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 767681 - 2² = 767677 is a prime.

It is a super-2 number, since 2×767681² = 1178668235522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (767381) 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, 383840 + 383841.

It is an arithmetic number, because the mean of its divisors is an integer number (383841).

2⁷⁶⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

767681 is a deficient number, since it is larger than the sum of its proper divisors (1).

767681 is an equidigital number, since it uses as much as digits as its factorization.

767681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 767681 is about 876.1740694634. The cubic root of 767681 is about 91.5644583482.

The spelling of 767681 in words is "seven hundred sixty-seven thousand, six hundred eighty-one".