30006728 has 24 divisors (see below), whose sum is σ = 57078630. Its totient is φ = 14788800.

The previous prime is 30006703. The next prime is 30006737. The reversal of 30006728 is 82760003.

It can be written as a sum of positive squares in only one way, i.e., 20994724 + 9012004 = 4582^2 + 3002^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30006697 and 30006706.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49628 + ... + 50228.

Almost surely, 2^30006728 is an apocalyptic number.

It is an amenable number.

30006728 is a deficient number, since it is larger than the sum of its proper divisors (27071902).

30006728 is an equidigital number, since it uses as much as digits as its factorization.

30006728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 30006728 is about 5477.8397201817. The cubic root of 30006728 is about 310.7464771484.

The spelling of 30006728 in words is "thirty million, six thousand, seven hundred twenty-eight".