81184283784 has 192 divisors, whose sum is σ = 233855331840. Its totient is φ = 25398282240.

The previous prime is 81184283729. The next prime is 81184283857. The reversal of 81184283784 is 48738248118.

It is a self number, because there is not a number n which added to its sum of digits gives 81184283784.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28655232 + ... + 28658064.

It is an arithmetic number, because the mean of its divisors is an integer number (1217996520).

Almost surely, 2^81184283784 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 81184283784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116927665920).

81184283784 is an abundant number, since it is smaller than the sum of its proper divisors (152671048056).

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

81184283784 is a wasteful number, since it uses less digits than its factorization.

81184283784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260 (or 3253 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The spelling of 81184283784 in words is "eighty-one billion, one hundred eighty-four million, two hundred eighty-three thousand, seven hundred eighty-four".