730428 has 12 divisors (see below), whose sum is σ = 1704360. Its totient is φ = 243472.

The previous prime is 730421. The next prime is 730447. The reversal of 730428 is 824037.

730428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 730398 and 730407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730421) by changing a digit.

730428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30423 + ... + 30446.

It is an arithmetic number, because the mean of its divisors is an integer number (142030).

2⁷³⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

730428 is an abundant number, since it is smaller than the sum of its proper divisors (973932).

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

730428 is a wasteful number, since it uses less digits than its factorization.

730428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60876 (or 60874 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 730428 is about 854.6508058851. The cubic root of 730428 is about 90.0587271030.

The spelling of 730428 in words is "seven hundred thirty thousand, four hundred twenty-eight".