81593428392 has 288 divisors, whose sum is σ = 271097517600. Its totient is φ = 22044089088.

The previous prime is 81593428313. The next prime is 81593428393. The reversal of 81593428392 is 29382439518.

81593428392 is a `hidden beast` number, since 8 + 1 + 593 + 42 + 8 + 3 + 9 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (81593428393) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 57177583 + ... + 57179009.

It is an arithmetic number, because the mean of its divisors is an integer number (941310825).

Almost surely, 2^81593428392 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 81593428392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135548758800).

81593428392 is an abundant number, since it is smaller than the sum of its proper divisors (189504089208).

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

81593428392 is a wasteful number, since it uses less digits than its factorization.

81593428392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325 (or 2311 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 81593428392 in words is "eighty-one billion, five hundred ninety-three million, four hundred twenty-eight thousand, three hundred ninety-two".