81203834880 has 1248 divisors, whose sum is σ = 349156774080. Its totient is φ = 18059231232.

The previous prime is 81203834869. The next prime is 81203834897. The reversal of 81203834880 is 8843830218.

It is a super-2 number, since 2×81203834880² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2194698222 + ... + 2194698258.

Almost surely, 2^81203834880 is an apocalyptic number.

81203834880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81203834880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174578387040).

81203834880 is an abundant number, since it is smaller than the sum of its proper divisors (267952939200).

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

81203834880 is an frugal number, since it uses more digits than its factorization.

81203834880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 81203834880 in words is "eighty-one billion, two hundred three million, eight hundred thirty-four thousand, eight hundred eighty".