30728821161125 has 16 divisors (see below), whose sum is σ = 38413378501680. Its totient is φ = 24542153280000.

The previous prime is 30728821161097. The next prime is 30728821161133. The reversal of 30728821161125 is 52116112882703.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 67694673124 + 30661126488001 = 260182^2 + 5537249^2 .

It is not a de Polignac number, because 30728821161125 - 2¹² = 30728821157029 is a prime.

It is a super-2 number, since 2×30728821161125² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30728821161125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204442820 + ... + 204593069.

It is an arithmetic number, because the mean of its divisors is an integer number (2400836156355).

Almost surely, 2^{30728821161125} is an apocalyptic number.

It is an amenable number.

30728821161125 is a deficient number, since it is larger than the sum of its proper divisors (7684557340555).

30728821161125 is an equidigital number, since it uses as much as digits as its factorization.

30728821161125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409036505 (or 409036495 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 30728821161125 in words is "thirty trillion, seven hundred twenty-eight billion, eight hundred twenty-one million, one hundred sixty-one thousand, one hundred twenty-five".