766878769 has 2 divisors, whose sum is σ = 766878770. Its totient is φ = 766878768.

The previous prime is 766878751. The next prime is 766878773. The reversal of 766878769 is 967878667.

It is a happy number.

766878769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 694849600 + 72029169 = 26360^2 + 8487^2 .

It is a cyclic number.

It is not a de Polignac number, because 766878769 - 2⁹ = 766878257 is a prime.

It is a super-2 number, since 2×766878769² = 1176206092685910722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 766878769.

It is not a weakly prime, because it can be changed into another prime (766878709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383439384 + 383439385.

It is an arithmetic number, because the mean of its divisors is an integer number (383439385).

Almost surely, 2^766878769 is an apocalyptic number.

It is an amenable number.

766878769 is a deficient number, since it is larger than the sum of its proper divisors (1).

766878769 is an equidigital number, since it uses as much as digits as its factorization.

766878769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 64.

The square root of 766878769 is about 27692.5760629090. The cubic root of 766878769 is about 915.3255210545.

The spelling of 766878769 in words is "seven hundred sixty-six million, eight hundred seventy-eight thousand, seven hundred sixty-nine".