81104302080 has 624 divisors, whose sum is σ = 299106487680. Its totient is φ = 21069103104.

The previous prime is 81104302061. The next prime is 81104302087. The reversal of 81104302080 is 8020340118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81104302087) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 213995331 + ... + 213995709.

It is an arithmetic number, because the mean of its divisors is an integer number (479337320).

Almost surely, 2^81104302080 is an apocalyptic number.

81104302080 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 81104302080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149553243840).

81104302080 is an abundant number, since it is smaller than the sum of its proper divisors (218002185600).

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

81104302080 is an equidigital number, since it uses as much as digits as its factorization.

81104302080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

Adding to 81104302080 its reverse (8020340118), we get a palindrome (89124642198).

The spelling of 81104302080 in words is "eighty-one billion, one hundred four million, three hundred two thousand, eighty".