81104760 has 128 divisors (see below), whose sum is σ = 294969600. Its totient is φ = 19658880.

The previous prime is 81104753. The next prime is 81104761. The reversal of 81104760 is 6740118.

It is a happy number.

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 (81104761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8467 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (2304450).

Almost surely, 2^81104760 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 81104760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147484800).

81104760 is an abundant number, since it is smaller than the sum of its proper divisors (213864840).

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

81104760 is a wasteful number, since it uses less digits than its factorization.

81104760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858 (or 6848 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81104760 is about 9005.8181194159. The cubic root of 81104760 is about 432.8613216788.

Adding to 81104760 its reverse (6740118), we get a palindrome (87844878).

The spelling of 81104760 in words is "eighty-one million, one hundred four thousand, seven hundred sixty".