764698409 has 2 divisors, whose sum is σ = 764698410. Its totient is φ = 764698408.

The previous prime is 764698397. The next prime is 764698423. The reversal of 764698409 is 904896467.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764688409 + 10000 = 27653^2 + 100^2 .

It is an emirp because it is prime and its reverse (904896467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764698409 - 2⁸ = 764698153 is a prime.

It is not a weakly prime, because it can be changed into another prime (764698439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382349204 + 382349205.

It is an arithmetic number, because the mean of its divisors is an integer number (382349205).

Almost surely, 2^764698409 is an apocalyptic number.

It is an amenable number.

764698409 is a deficient number, since it is larger than the sum of its proper divisors (1).

764698409 is an equidigital number, since it uses as much as digits as its factorization.

764698409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 764698409 is about 27653.1808116173. The cubic root of 764698409 is about 914.4572249474.

The spelling of 764698409 in words is "seven hundred sixty-four million, six hundred ninety-eight thousand, four hundred nine".