30947128 has 16 divisors (see below), whose sum is σ = 59441760. Its totient is φ = 15096000.

The previous prime is 30947117. The next prime is 30947149. The reversal of 30947128 is 82174903.

It is a junction number, because it is equal to n+sod(n) for n = 30947093 and 30947102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46848 + ... + 47503.

It is an arithmetic number, because the mean of its divisors is an integer number (3715110).

Almost surely, 2^30947128 is an apocalyptic number.

It is an amenable number.

30947128 is a deficient number, since it is larger than the sum of its proper divisors (28494632).

30947128 is a wasteful number, since it uses less digits than its factorization.

30947128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94398 (or 94394 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 30947128 is about 5563.0142908319. The cubic root of 30947128 is about 313.9593710532.

The spelling of 30947128 in words is "thirty million, nine hundred forty-seven thousand, one hundred twenty-eight".