723781728 has 36 divisors (see below), whose sum is σ = 2058255108. Its totient is φ = 241260480.

The previous prime is 723781697. The next prime is 723781741. The reversal of 723781728 is 827187327.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1256278 + ... + 1256853.

It is an arithmetic number, because the mean of its divisors is an integer number (57173753).

Almost surely, 2^723781728 is an apocalyptic number.

It is an amenable number.

723781728 is an abundant number, since it is smaller than the sum of its proper divisors (1334473380).

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

723781728 is a wasteful number, since it uses less digits than its factorization.

723781728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513147 (or 2513136 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 723781728 is about 26903.1917809021. The cubic root of 723781728 is about 897.8474186158.

The spelling of 723781728 in words is "seven hundred twenty-three million, seven hundred eighty-one thousand, seven hundred twenty-eight".