723643009 has 4 divisors (see below), whose sum is σ = 723754800. Its totient is φ = 723531220.

The previous prime is 723642967. The next prime is 723643021. The reversal of 723643009 is 900346327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900346327 = 137 ⋅6571871.

It is a cyclic number.

It is not a de Polignac number, because 723643009 - 2¹⁵ = 723610241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723643099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45547 + ... + 59344.

It is an arithmetic number, because the mean of its divisors is an integer number (180938700).

Almost surely, 2^723643009 is an apocalyptic number.

It is an amenable number.

723643009 is a deficient number, since it is larger than the sum of its proper divisors (111791).

723643009 is a wasteful number, since it uses less digits than its factorization.

723643009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111790.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 723643009 is about 26900.6135431889. The cubic root of 723643009 is about 897.7900548881.

The spelling of 723643009 in words is "seven hundred twenty-three million, six hundred forty-three thousand, nine".