81034905600 has 864 divisors, whose sum is σ = 329224240800. Its totient is φ = 19375718400.

The previous prime is 81034905593. The next prime is 81034905613. The reversal of 81034905600 is 650943018.

81034905600 is a `hidden beast` number, since 8 + 1 + 0 + 3 + 4 + 90 + 560 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a super-2 number, since 2×81034905600² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1110067164 + ... + 1110067236.

It is an arithmetic number, because the mean of its divisors is an integer number (381046575).

Almost surely, 2^81034905600 is an apocalyptic number.

81034905600 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 81034905600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164612120400).

81034905600 is an abundant number, since it is smaller than the sum of its proper divisors (248189335200).

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

81034905600 is a wasteful number, since it uses less digits than its factorization.

81034905600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 81034905600 in words is "eighty-one billion, thirty-four million, nine hundred five thousand, six hundred".