30891584056 has 8 divisors (see below), whose sum is σ = 57921720120. Its totient is φ = 15445792024.

The previous prime is 30891583993. The next prime is 30891584099. The reversal of 30891584056 is 65048519803.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×30891584056² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930723996 + ... + 1930724011.

It is an arithmetic number, because the mean of its divisors is an integer number (7240215015).

Almost surely, 2^30891584056 is an apocalyptic number.

It is an amenable number.

30891584056 is a deficient number, since it is larger than the sum of its proper divisors (27030136064).

30891584056 is a wasteful number, since it uses less digits than its factorization.

30891584056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861448013 (or 3861448009 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 30891584056 in words is "thirty billion, eight hundred ninety-one million, five hundred eighty-four thousand, fifty-six".