81296200 has 24 divisors (see below), whose sum is σ = 189014130. Its totient is φ = 32518400.

The previous prime is 81296179. The next prime is 81296203. The reversal of 81296200 is 269218.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 35354916 + 45941284 = 5946^2 + 6778^2 .

It is not an unprimeable number, because it can be changed into a prime (81296203) 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 5 ways as a sum of consecutive naturals, for example, 203041 + ... + 203440.

Almost surely, 2^81296200 is an apocalyptic number.

It is an amenable number.

81296200 is an abundant number, since it is smaller than the sum of its proper divisors (107717930).

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

81296200 is a wasteful number, since it uses less digits than its factorization.

81296200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406497 (or 406488 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 81296200 is about 9016.4405393703. The cubic root of 81296200 is about 433.2016299293.

The spelling of 81296200 in words is "eighty-one million, two hundred ninety-six thousand, two hundred".