723394816 has 45 divisors (see below), whose sum is σ = 1480062955. Its totient is φ = 352875520.

The previous prime is 723394799. The next prime is 723394817. The reversal of 723394816 is 618493327.

The square root of 723394816 is 26896.

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

It can be written as a sum of positive squares in 2 ways, for example, as 590684416 + 132710400 = 24304^2 + 11520^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723394817) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 17643756 + ... + 17643796.

Almost surely, 2^723394816 is an apocalyptic number.

723394816 is the 26896-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723394816

723394816 is an abundant number, since it is smaller than the sum of its proper divisors (756668139).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723394816 is an frugal number, since it uses more digits than its factorization.

723394816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 43 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The cubic root of 723394816 is about 897.6874026669.

The spelling of 723394816 in words is "seven hundred twenty-three million, three hundred ninety-four thousand, eight hundred sixteen".