81230935500 has 288 divisors, whose sum is σ = 301059001152. Its totient is φ = 18177408000.

The previous prime is 81230935483. The next prime is 81230935501. The reversal of 81230935500 is 553903218.

81230935500 is a `hidden beast` number, since 8 + 12 + 3 + 0 + 93 + 550 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81230935501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 580384 + ... + 706616.

It is an arithmetic number, because the mean of its divisors is an integer number (1045343754).

Almost surely, 2^81230935500 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 81230935500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150529500576).

81230935500 is an abundant number, since it is smaller than the sum of its proper divisors (219828065652).

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

81230935500 is a wasteful number, since it uses less digits than its factorization.

81230935500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126282 (or 126267 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 81230935500 in words is "eighty-one billion, two hundred thirty million, nine hundred thirty-five thousand, five hundred".