704670509 has 2 divisors, whose sum is σ = 704670510. Its totient is φ = 704670508.

The previous prime is 704670443. The next prime is 704670511. The reversal of 704670509 is 905076407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443944900 + 260725609 = 21070^2 + 16147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-704670509 is a prime.

Together with 704670511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (704670539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352335254 + 352335255.

It is an arithmetic number, because the mean of its divisors is an integer number (352335255).

Almost surely, 2^704670509 is an apocalyptic number.

It is an amenable number.

704670509 is a deficient number, since it is larger than the sum of its proper divisors (1).

704670509 is an equidigital number, since it uses as much as digits as its factorization.

704670509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 704670509 is about 26545.6306950880. The cubic root of 704670509 is about 889.8743706022.

The spelling of 704670509 in words is "seven hundred four million, six hundred seventy thousand, five hundred nine".