30442728 has 16 divisors (see below), whose sum is σ = 76106880. Its totient is φ = 10147568.

The previous prime is 30442703. The next prime is 30442739. The reversal of 30442728 is 82724403.

It is a junction number, because it is equal to n+sod(n) for n = 30442695 and 30442704.

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, 634200 + ... + 634247.

It is an arithmetic number, because the mean of its divisors is an integer number (4756680).

Almost surely, 2^30442728 is an apocalyptic number.

It is an amenable number.

30442728 is an abundant number, since it is smaller than the sum of its proper divisors (45664152).

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

30442728 is a wasteful number, since it uses less digits than its factorization.

30442728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268456 (or 1268452 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 30442728 is about 5517.4929089216. The cubic root of 30442728 is about 312.2443024104.

The spelling of 30442728 in words is "thirty million, four hundred forty-two thousand, seven hundred twenty-eight".