81593296824 has 256 divisors, whose sum is σ = 229485312000. Its totient is φ = 24015974400.

The previous prime is 81593296793. The next prime is 81593296853. The reversal of 81593296824 is 42869239518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131814387 + ... + 131815005.

It is an arithmetic number, because the mean of its divisors is an integer number (896427000).

Almost surely, 2^81593296824 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 81593296824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114742656000).

81593296824 is an abundant number, since it is smaller than the sum of its proper divisors (147892015176).

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

81593296824 is a wasteful number, since it uses less digits than its factorization.

81593296824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 874 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 57.

The spelling of 81593296824 in words is "eighty-one billion, five hundred ninety-three million, two hundred ninety-six thousand, eight hundred twenty-four".