30748728 has 32 divisors (see below), whose sum is σ = 77103360. Its totient is φ = 10218720.

The previous prime is 30748717. The next prime is 30748759. The reversal of 30748728 is 82784703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7063 + ... + 10553.

It is an arithmetic number, because the mean of its divisors is an integer number (2409480).

Almost surely, 2^30748728 is an apocalyptic number.

It is an amenable number.

30748728 is an abundant number, since it is smaller than the sum of its proper divisors (46354632).

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

30748728 is a wasteful number, since it uses less digits than its factorization.

30748728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3867 (or 3863 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 30748728 is about 5545.1535596411. The cubic root of 30748728 is about 313.2870078889.

The spelling of 30748728 in words is "thirty million, seven hundred forty-eight thousand, seven hundred twenty-eight".