704743209 has 9 divisors (see below), whose sum is σ = 1018077463. Its totient is φ = 469775712.

The previous prime is 704743163. The next prime is 704743339. The reversal of 704743209 is 902347407.

The square root of 704743209 is 26547.

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

It can be written as a sum of positive squares in only one way, i.e., 1432809 + 703310400 = 1197^2 + 26520^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 704743209 - 2¹⁷ = 704612137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (704343209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 75217 + ... + 84065.

Almost surely, 2^704743209 is an apocalyptic number.

704743209 is the 26547-th square number.

704743209 is the 13274-th centered octagonal number.

It is an amenable number.

704743209 is a deficient number, since it is larger than the sum of its proper divisors (313334254).

704743209 is an frugal number, since it uses more digits than its factorization.

704743209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17704 (or 8852 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The cubic root of 704743209 is about 889.9049719690.

Multiplying 704743209 by its sum of digits (36), we get a square (25370755524 = 159282²).

The spelling of 704743209 in words is "seven hundred four million, seven hundred forty-three thousand, two hundred nine".