30728337025 has 9 divisors (see below), whose sum is σ = 38104224771. Its totient is φ = 24581968440.

The previous prime is 30728337023. The next prime is 30728337053. The reversal of 30728337025 is 52073382703.

The square root of 30728337025 is 175295.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11062201329 + 19666135696 = 105177^2 + 140236^2 .

It is not a de Polignac number, because 30728337025 - 2¹ = 30728337023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30728337023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 858946 + ... + 894004.

Almost surely, 2^30728337025 is an apocalyptic number.

30728337025 is the 175295-th square number.

30728337025 is the 87648-th centered octagonal number.

It is an amenable number.

30728337025 is a deficient number, since it is larger than the sum of its proper divisors (7375887746).

30728337025 is an frugal number, since it uses more digits than its factorization.

30728337025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70128 (or 35064 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 30728337025 in words is "thirty billion, seven hundred twenty-eight million, three hundred thirty-seven thousand, twenty-five".