81063500 has 192 divisors, whose sum is σ = 226437120. Its totient is φ = 24710400.

The previous prime is 81063487. The next prime is 81063503. The reversal of 81063500 is 536018.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81063503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1529474 + ... + 1529526.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^81063500 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 81063500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113218560).

81063500 is an abundant number, since it is smaller than the sum of its proper divisors (145373620).

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

81063500 is a wasteful number, since it uses less digits than its factorization.

81063500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 81063500 is about 9003.5270866478. The cubic root of 81063500 is about 432.7879068033.

Adding to 81063500 its reverse (536018), we get a palindrome (81599518).

The spelling of 81063500 in words is "eighty-one million, sixty-three thousand, five hundred".