704564809 has 4 divisors (see below), whose sum is σ = 758762116. Its totient is φ = 650367504.

The previous prime is 704564803. The next prime is 704564837. The reversal of 704564809 is 908465407.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908465407 = 101 ⋅8994707.

It can be written as a sum of positive squares in 2 ways, for example, as 62094400 + 642470409 = 7880^2 + 25347^2 .

It is a cyclic number.

It is not a de Polignac number, because 704564809 - 2³ = 704564801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (704564801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27098634 + ... + 27098659.

It is an arithmetic number, because the mean of its divisors is an integer number (189690529).

Almost surely, 2^704564809 is an apocalyptic number.

It is an amenable number.

704564809 is a deficient number, since it is larger than the sum of its proper divisors (54197307).

704564809 is a wasteful number, since it uses less digits than its factorization.

704564809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54197306.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 704564809 is about 26543.6397089774. The cubic root of 704564809 is about 889.8298749015.

The spelling of 704564809 in words is "seven hundred four million, five hundred sixty-four thousand, eight hundred nine".