730728 has 64 divisors (see below), whose sum is σ = 2160000. Its totient is φ = 228096.

The previous prime is 730727. The next prime is 730747. The reversal of 730728 is 827037.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (730727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3573 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (33750).

2⁷³⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 730728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080000).

730728 is an abundant number, since it is smaller than the sum of its proper divisors (1429272).

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

730728 is a wasteful number, since it uses less digits than its factorization.

730728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 730728 is about 854.8262981448. The cubic root of 730728 is about 90.0710549984.

The spelling of 730728 in words is "seven hundred thirty thousand, seven hundred twenty-eight".