30719947856 has 80 divisors (see below), whose sum is σ = 66192846720. Its totient is φ = 13721218560.

The previous prime is 30719947807. The next prime is 30719947871. The reversal of 30719947856 is 65874991703.

It is a junction number, because it is equal to n+sod(n) for n = 30719947795 and 30719947804.

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, 959141 + ... + 990651.

It is an arithmetic number, because the mean of its divisors is an integer number (827410584).

Almost surely, 2^30719947856 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 30719947856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33096423360).

30719947856 is an abundant number, since it is smaller than the sum of its proper divisors (35472898864).

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

30719947856 is a wasteful number, since it uses less digits than its factorization.

30719947856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31684 (or 31678 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 30719947856 in words is "thirty billion, seven hundred nineteen million, nine hundred forty-seven thousand, eight hundred fifty-six".