81343700 has 36 divisors (see below), whose sum is σ = 177717792. Its totient is φ = 32316000.

The previous prime is 81343697. The next prime is 81343733. The reversal of 81343700 is 734318.

It is a super-3 number, since 3×81343700³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81343700.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 12407 + ... + 17793.

Almost surely, 2^81343700 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 81343700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88858896).

81343700 is an abundant number, since it is smaller than the sum of its proper divisors (96374092).

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

81343700 is a wasteful number, since it uses less digits than its factorization.

81343700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552 (or 5545 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 81343700 is about 9019.0742318710. The cubic root of 81343700 is about 433.2859843071.

The spelling of 81343700 in words is "eighty-one million, three hundred forty-three thousand, seven hundred".