81984949272 has 96 divisors (see below), whose sum is σ = 225207777600. Its totient is φ = 26939847168.

The previous prime is 81984949237. The next prime is 81984949297. The reversal of 81984949272 is 27294948918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3703228 + ... + 3725300.

It is an arithmetic number, because the mean of its divisors is an integer number (2345914350).

Almost surely, 2^81984949272 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 81984949272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112603888800).

81984949272 is an abundant number, since it is smaller than the sum of its proper divisors (143222828328).

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

81984949272 is a wasteful number, since it uses less digits than its factorization.

81984949272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22817 (or 22810 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 81984949272 in words is "eighty-one billion, nine hundred eighty-four million, nine hundred forty-nine thousand, two hundred seventy-two".