81160200 has 144 divisors (see below), whose sum is σ = 297414000. Its totient is φ = 19670400.

The previous prime is 81160199. The next prime is 81160213. The reversal of 81160200 is 206118.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17751 + ... + 21849.

It is an arithmetic number, because the mean of its divisors is an integer number (2065375).

Almost surely, 2^81160200 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 81160200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148707000).

81160200 is an abundant number, since it is smaller than the sum of its proper divisors (216253800).

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

81160200 is a wasteful number, since it uses less digits than its factorization.

81160200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132 (or 4120 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81160200 is about 9008.8956037907. The cubic root of 81160200 is about 432.9599281632.

Adding to 81160200 its reverse (206118), we get a palindrome (81366318).

The spelling of 81160200 in words is "eighty-one million, one hundred sixty thousand, two hundred".