81050200 has 192 divisors, whose sum is σ = 248198400. Its totient is φ = 23846400.

The previous prime is 81050191. The next prime is 81050201. The reversal of 81050200 is 205018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81050201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292462 + ... + 292738.

It is an arithmetic number, because the mean of its divisors is an integer number (1292700).

Almost surely, 2^81050200 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 81050200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124099200).

81050200 is an abundant number, since it is smaller than the sum of its proper divisors (167148200).

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

81050200 is a wasteful number, since it uses less digits than its factorization.

81050200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 81050200 is about 9002.7884569171. The cubic root of 81050200 is about 432.7642364955.

Adding to 81050200 its reverse (205018), we get a palindrome (81255218).

The spelling of 81050200 in words is "eighty-one million, fifty thousand, two hundred".