81893480032 has 192 divisors, whose sum is σ = 204081026688. Its totient is φ = 31481856000.

The previous prime is 81893480023. The next prime is 81893480069. The reversal of 81893480032 is 23008439818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33547932 + ... + 33550372.

It is an arithmetic number, because the mean of its divisors is an integer number (1062922014).

Almost surely, 2^81893480032 is an apocalyptic number.

81893480032 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81893480032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102040513344).

81893480032 is an abundant number, since it is smaller than the sum of its proper divisors (122187546656).

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

81893480032 is a wasteful number, since it uses less digits than its factorization.

81893480032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 81893480032 in words is "eighty-one billion, eight hundred ninety-three million, four hundred eighty thousand, thirty-two".