81792055800 has 768 divisors, whose sum is σ = 367176499200. Its totient is φ = 16240435200.

The previous prime is 81792055777. The next prime is 81792055801. The reversal of 81792055800 is 855029718.

It is a happy number.

81792055800 is a `hidden beast` number, since 8 + 1 + 7 + 92 + 0 + 558 + 0 + 0 = 666.

It is a super-3 number, since 3×81792055800³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81792055801) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 8348905 + ... + 8358695.

It is an arithmetic number, because the mean of its divisors is an integer number (478094400).

Almost surely, 2^81792055800 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 81792055800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183588249600).

81792055800 is an abundant number, since it is smaller than the sum of its proper divisors (285384443400).

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

81792055800 is a wasteful number, since it uses less digits than its factorization.

81792055800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9853 (or 9838 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 81792055800 in words is "eighty-one billion, seven hundred ninety-two million, fifty-five thousand, eight hundred".