30045728 has 24 divisors (see below), whose sum is σ = 61725888. Its totient is φ = 14369344.

The previous prime is 30045721. The next prime is 30045779. The reversal of 30045728 is 82754003.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 30045728.

It is not an unprimeable number, because it can be changed into a prime (30045721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19676 + ... + 21147.

It is an arithmetic number, because the mean of its divisors is an integer number (2571912).

Almost surely, 2^30045728 is an apocalyptic number.

It is an amenable number.

30045728 is an abundant number, since it is smaller than the sum of its proper divisors (31680160).

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

30045728 is a wasteful number, since it uses less digits than its factorization.

30045728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40856 (or 40848 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 30045728 is about 5481.3983617322. The cubic root of 30045728 is about 310.8810454798.

The spelling of 30045728 in words is "thirty million, forty-five thousand, seven hundred twenty-eight".