764356609 has 3 divisors (see below), whose sum is σ = 764384257. Its totient is φ = 764328962.

The previous prime is 764356591. The next prime is 764356613. The reversal of 764356609 is 906653467.

The square root of 764356609 is 27647.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 906653467 = 101 ⋅8976767.

It is not a de Polignac number, because 764356609 - 2⁵ = 764356577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764356639) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13824 + ... + 41470.

Almost surely, 2^764356609 is an apocalyptic number.

764356609 is the 27647-th square number.

764356609 is the 13824-th centered octagonal number.

It is an amenable number.

764356609 is a deficient number, since it is larger than the sum of its proper divisors (27648).

764356609 is an frugal number, since it uses more digits than its factorization.

764356609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55294 (or 27647 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The cubic root of 764356609 is about 914.3209585639.

The spelling of 764356609 in words is "seven hundred sixty-four million, three hundred fifty-six thousand, six hundred nine".