728209923 has 64 divisors (see below), whose sum is σ = 1223424000. Its totient is φ = 383940480.

The previous prime is 728209907. The next prime is 728209949. The reversal of 728209923 is 329902827.

728209923 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 728209923 - 2⁴ = 728209907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728209423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 685813 + ... + 686873.

It is an arithmetic number, because the mean of its divisors is an integer number (19116000).

Almost surely, 2^728209923 is an apocalyptic number.

728209923 is a deficient number, since it is larger than the sum of its proper divisors (495214077).

728209923 is a wasteful number, since it uses less digits than its factorization.

728209923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 728209923 is about 26985.3649780765. The cubic root of 728209923 is about 899.6747479030.

The spelling of 728209923 in words is "seven hundred twenty-eight million, two hundred nine thousand, nine hundred twenty-three".