723668409 has 48 divisors (see below), whose sum is σ = 1134544320. Its totient is φ = 442990080.

The previous prime is 723668401. The next prime is 723668441. The reversal of 723668409 is 904866327.

723668409 is a `hidden beast` number, since 7 + 236 + 6 + 8 + 409 = 666.

723668409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 723668409 - 2³ = 723668401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (723668401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1633342 + ... + 1633784.

It is an arithmetic number, because the mean of its divisors is an integer number (23636340).

Almost surely, 2^723668409 is an apocalyptic number.

It is an amenable number.

723668409 is a deficient number, since it is larger than the sum of its proper divisors (410875911).

723668409 is a wasteful number, since it uses less digits than its factorization.

723668409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 723668409 is about 26901.0856472374. The cubic root of 723668409 is about 897.8005589628.

The spelling of 723668409 in words is "seven hundred twenty-three million, six hundred sixty-eight thousand, four hundred nine".