30025728 has 120 divisors (see below), whose sum is σ = 90180090. Its totient is φ = 9953280.

The previous prime is 30025727. The next prime is 30025733. The reversal of 30025728 is 82752003.

It can be written as a sum of positive squares in only one way, i.e., 29942784 + 82944 = 5472^2 + 288^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30025727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 165798 + ... + 165978.

Almost surely, 2^30025728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30025728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45090045).

30025728 is an abundant number, since it is smaller than the sum of its proper divisors (60154362).

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

30025728 is an equidigital number, since it uses as much as digits as its factorization.

30025728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30025728 is about 5479.5737060468. The cubic root of 30025728 is about 310.8120506352.

The spelling of 30025728 in words is "thirty million, twenty-five thousand, seven hundred twenty-eight".