81343200 has 72 divisors (see below), whose sum is σ = 264779928. Its totient is φ = 21690880.

The previous prime is 81343193. The next prime is 81343211. The reversal of 81343200 is 234318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14547 + ... + 19346.

It is an arithmetic number, because the mean of its divisors is an integer number (3677499).

Almost surely, 2^81343200 is an apocalyptic number.

81343200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81343200 is an abundant number, since it is smaller than the sum of its proper divisors (183436728).

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

81343200 is a wasteful number, since it uses less digits than its factorization.

81343200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33916 (or 33903 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 81343200 is about 9019.0465127972. The cubic root of 81343200 is about 433.2850965373.

Adding to 81343200 its reverse (234318), we get a palindrome (81577518).

The spelling of 81343200 in words is "eighty-one million, three hundred forty-three thousand, two hundred".