81104500 has 24 divisors (see below), whose sum is σ = 177133320. Its totient is φ = 32441600.

The previous prime is 81104489. The next prime is 81104537. The reversal of 81104500 is 540118.

It can be written as a sum of positive squares in 4 ways, for example, as 320356 + 80784144 = 566^2 + 8988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80605 + ... + 81604.

It is an arithmetic number, because the mean of its divisors is an integer number (7380555).

Almost surely, 2^81104500 is an apocalyptic number.

It is an amenable number.

81104500 is an abundant number, since it is smaller than the sum of its proper divisors (96028820).

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

81104500 is a wasteful number, since it uses less digits than its factorization.

81104500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162228 (or 162216 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 81104500 is about 9005.8036842916. The cubic root of 81104500 is about 432.8608591327.

Adding to 81104500 its reverse (540118), we get a palindrome (81644618).

The spelling of 81104500 in words is "eighty-one million, one hundred four thousand, five hundred".