764321609 has 2 divisors, whose sum is σ = 764321610. Its totient is φ = 764321608.

The previous prime is 764321599. The next prime is 764321659. The reversal of 764321609 is 906123467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521117584 + 243204025 = 22828^2 + 15595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764321609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (764321659) 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, 382160804 + 382160805.

It is an arithmetic number, because the mean of its divisors is an integer number (382160805).

Almost surely, 2^764321609 is an apocalyptic number.

It is an amenable number.

764321609 is a deficient number, since it is larger than the sum of its proper divisors (1).

764321609 is an equidigital number, since it uses as much as digits as its factorization.

764321609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 764321609 is about 27646.3670126836. The cubic root of 764321609 is about 914.3070027212.

The spelling of 764321609 in words is "seven hundred sixty-four million, three hundred twenty-one thousand, six hundred nine".