81034500 has 96 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 21331200.

The previous prime is 81034469. The next prime is 81034507. The reversal of 81034500 is 543018.

It is not an unprimeable number, because it can be changed into a prime (81034507) 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, 133197 + ... + 133803.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^81034500 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 81034500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119508480).

81034500 is an abundant number, since it is smaller than the sum of its proper divisors (157982460).

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

81034500 is a wasteful number, since it uses less digits than its factorization.

81034500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 81034500 is about 9001.9164626206. The cubic root of 81034500 is about 432.7362915212.

Adding to 81034500 its reverse (543018), we get a palindrome (81577518).

The spelling of 81034500 in words is "eighty-one million, thirty-four thousand, five hundred".