30666728 has 16 divisors (see below), whose sum is σ = 60000480. Its totient is φ = 14666608.

The previous prime is 30666689. The next prime is 30666739. The reversal of 30666728 is 82766603.

It is a junction number, because it is equal to n+sod(n) for n = 30666691 and 30666700.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 83150 + ... + 83517.

It is an arithmetic number, because the mean of its divisors is an integer number (3750030).

Almost surely, 2^30666728 is an apocalyptic number.

It is an amenable number.

30666728 is a deficient number, since it is larger than the sum of its proper divisors (29333752).

30666728 is a wasteful number, since it uses less digits than its factorization.

30666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166696 (or 166692 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 30666728 is about 5537.7547796919. The cubic root of 30666728 is about 313.0082711054.

The spelling of 30666728 in words is "thirty million, six hundred sixty-six thousand, seven hundred twenty-eight".