4320728 has 16 divisors (see below), whose sum is σ = 8127000. Its totient is φ = 2153536.

The previous prime is 4320721. The next prime is 4320761. The reversal of 4320728 is 8270234.

It is a junction number, because it is equal to n+sod(n) for n = 4320697 and 4320706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4320721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708 + ... + 3996.

Almost surely, 2^4320728 is an apocalyptic number.

It is an amenable number.

4320728 is a deficient number, since it is larger than the sum of its proper divisors (3806272).

4320728 is a wasteful number, since it uses less digits than its factorization.

4320728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1710 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 4320728 is about 2078.6360912868. The cubic root of 4320728 is about 162.8742050745.

The spelling of 4320728 in words is "four million, three hundred twenty thousand, seven hundred twenty-eight".