31889930000 has 200 divisors, whose sum is σ = 80372772480. Its totient is φ = 12242880000.

The previous prime is 31889929993. The next prime is 31889930021. The reversal of 31889930000 is 3998813.

It is a tau number, because it is divible by the number of its divisors (200).

It is a self number, because there is not a number n which added to its sum of digits gives 31889930000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29229455 + ... + 29230545.

Almost surely, 2^31889930000 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 31889930000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40186386240).

31889930000 is an abundant number, since it is smaller than the sum of its proper divisors (48482842480).

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

31889930000 is a wasteful number, since it uses less digits than its factorization.

31889930000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 31889930000 in words is "thirty-one billion, eight hundred eighty-nine million, nine hundred thirty thousand".