81044200 has 24 divisors (see below), whose sum is σ = 188428230. Its totient is φ = 32417600.

The previous prime is 81044191. The next prime is 81044209. The reversal of 81044200 is 244018.

It is an interprime number because it is at equal distance from previous prime (81044191) and next prime (81044209).

It can be written as a sum of positive squares in 3 ways, for example, as 60559524 + 20484676 = 7782^2 + 4526^2 .

It is not an unprimeable number, because it can be changed into a prime (81044209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202411 + ... + 202810.

Almost surely, 2^81044200 is an apocalyptic number.

It is an amenable number.

81044200 is an abundant number, since it is smaller than the sum of its proper divisors (107384030).

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

81044200 is a wasteful number, since it uses less digits than its factorization.

81044200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405237 (or 405228 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 81044200 is about 9002.4552206606. The cubic root of 81044200 is about 432.7535573136.

Adding to 81044200 its reverse (244018), we get a palindrome (81288218).

The spelling of 81044200 in words is "eighty-one million, forty-four thousand, two hundred".