723728 has 10 divisors (see below), whose sum is σ = 1402254. Its totient is φ = 361856.

The previous prime is 723727. The next prime is 723739. The reversal of 723728 is 827327.

It can be written as a sum of positive squares in only one way, i.e., 719104 + 4624 = 848^2 + 68^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 723728.

It is not an unprimeable number, because it can be changed into a prime (723721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22601 + ... + 22632.

2⁷²³⁷²⁸ is an apocalyptic number.

It is an amenable number.

723728 is a deficient number, since it is larger than the sum of its proper divisors (678526).

723728 is a wasteful number, since it uses less digits than its factorization.

723728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45241 (or 45235 counting only the distinct ones).

The product of its digits is 4704, while the sum is 29.

The square root of 723728 is about 850.7220462642. The cubic root of 723728 is about 89.7825201632.

The spelling of 723728 in words is "seven hundred twenty-three thousand, seven hundred twenty-eight".