764689 has 2 divisors, whose sum is σ = 764690. Its totient is φ = 764688.

The previous prime is 764683. The next prime is 764717. The reversal of 764689 is 986467.

764689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588289 + 176400 = 767^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 764689 - 2⁵ = 764657 is a prime.

It is not a weakly prime, because it can be changed into another prime (764683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382344 + 382345.

It is an arithmetic number, because the mean of its divisors is an integer number (382345).

2⁷⁶⁴⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

764689 is a deficient number, since it is larger than the sum of its proper divisors (1).

764689 is an equidigital number, since it uses as much as digits as its factorization.

764689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 764689 is about 874.4649792873. The cubic root of 764689 is about 91.4453474378.

The spelling of 764689 in words is "seven hundred sixty-four thousand, six hundred eighty-nine".