81104784 has 40 divisors (see below), whose sum is σ = 209971680. Its totient is φ = 26976768.

The previous prime is 81104761. The next prime is 81104843. The reversal of 81104784 is 48740118.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 24712 + ... + 27800.

It is an arithmetic number, because the mean of its divisors is an integer number (5249292).

Almost surely, 2^81104784 is an apocalyptic number.

It is an amenable number.

81104784 is an abundant number, since it is smaller than the sum of its proper divisors (128866896).

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

81104784 is a wasteful number, since it uses less digits than its factorization.

81104784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3641 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 81104784 is about 9005.8194518878. The cubic root of 81104784 is about 432.8613643753.

The spelling of 81104784 in words is "eighty-one million, one hundred four thousand, seven hundred eighty-four".