30191861568 has 112 divisors (see below), whose sum is σ = 87396523200. Its totient is φ = 9122611200.

The previous prime is 30191861549. The next prime is 30191861573. The reversal of 30191861568 is 86516819103.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 716608 + ... + 757568.

It is an arithmetic number, because the mean of its divisors is an integer number (780326100).

Almost surely, 2^30191861568 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 30191861568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43698261600).

30191861568 is an abundant number, since it is smaller than the sum of its proper divisors (57204661632).

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

30191861568 is a wasteful number, since it uses less digits than its factorization.

30191861568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41336 (or 41326 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 30191861568 in words is "thirty billion, one hundred ninety-one million, eight hundred sixty-one thousand, five hundred sixty-eight".