30857727138 has 64 divisors (see below), whose sum is σ = 74430074880. Its totient is φ = 8331552000.

The previous prime is 30857727137. The next prime is 30857727169. The reversal of 30857727138 is 83172775803.

It is not an unprimeable number, because it can be changed into a prime (30857727133) 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 31 ways as a sum of consecutive naturals, for example, 271783 + ... + 368213.

It is an arithmetic number, because the mean of its divisors is an integer number (1162969920).

Almost surely, 2^30857727138 is an apocalyptic number.

30857727138 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30857727138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37215037440).

30857727138 is an abundant number, since it is smaller than the sum of its proper divisors (43572347742).

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

30857727138 is a wasteful number, since it uses less digits than its factorization.

30857727138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96863.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 30857727138 in words is "thirty billion, eight hundred fifty-seven million, seven hundred twenty-seven thousand, one hundred thirty-eight".