30328728 has 16 divisors (see below), whose sum is σ = 75821880. Its totient is φ = 10109568.

The previous prime is 30328687. The next prime is 30328733. The reversal of 30328728 is 82782303.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631825 + ... + 631872.

Almost surely, 2^30328728 is an apocalyptic number.

It is an amenable number.

30328728 is an abundant number, since it is smaller than the sum of its proper divisors (45493152).

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

30328728 is a wasteful number, since it uses less digits than its factorization.

30328728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263706 (or 1263702 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 30328728 is about 5507.1524402362. The cubic root of 30328728 is about 311.8540573190.

The spelling of 30328728 in words is "thirty million, three hundred twenty-eight thousand, seven hundred twenty-eight".