81630290192 has 80 divisors (see below), whose sum is σ = 182916667584. Its totient is φ = 34877952000.

The previous prime is 81630290179. The next prime is 81630290201. The reversal of 81630290192 is 29109203618.

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, 2409692 + ... + 2443332.

Almost surely, 2^81630290192 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 81630290192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91458333792).

81630290192 is an abundant number, since it is smaller than the sum of its proper divisors (101286377392).

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

81630290192 is a wasteful number, since it uses less digits than its factorization.

81630290192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34488 (or 34482 counting only the distinct ones).

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

The spelling of 81630290192 in words is "eighty-one billion, six hundred thirty million, two hundred ninety thousand, one hundred ninety-two".