728323900 has 36 divisors (see below), whose sum is σ = 1586148480. Its totient is φ = 290281600.

The previous prime is 728323879. The next prime is 728323901. The reversal of 728323900 is 9323827.

It is a super-2 number, since 2×728323900² = 1060911406622420000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728323901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15141 + ... + 41059.

It is an arithmetic number, because the mean of its divisors is an integer number (44059680).

Almost surely, 2^728323900 is an apocalyptic number.

It is an amenable number.

728323900 is an abundant number, since it is smaller than the sum of its proper divisors (857824580).

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

728323900 is a wasteful number, since it uses less digits than its factorization.

728323900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26214 (or 26207 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 728323900 is about 26987.4767253258. The cubic root of 728323900 is about 899.7216834894.

The spelling of 728323900 in words is "seven hundred twenty-eight million, three hundred twenty-three thousand, nine hundred".