30136521728 has 44 divisors (see below), whose sum is σ = 60494082132. Its totient is φ = 15005614080.

The previous prime is 30136521659. The next prime is 30136521743. The reversal of 30136521728 is 82712563103.

It can be written as a sum of positive squares in 2 ways, for example, as 25538596864 + 4597924864 = 159808^2 + 67808^2 .

It is a super-2 number, since 2×30136521728² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30136521691 and 30136521700.

It is a congruent number.

It is an unprimeable number.

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, 185726 + ... + 307842.

It is an arithmetic number, because the mean of its divisors is an integer number (1374865503).

Almost surely, 2^30136521728 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 30136521728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30247041066).

30136521728 is an abundant number, since it is smaller than the sum of its proper divisors (30357560404).

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

30136521728 is a wasteful number, since it uses less digits than its factorization.

30136521728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122378 (or 122360 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 30136521728 in words is "thirty billion, one hundred thirty-six million, five hundred twenty-one thousand, seven hundred twenty-eight".