81343698 has 8 divisors (see below), whose sum is σ = 162687408. Its totient is φ = 27114564.

The previous prime is 81343697. The next prime is 81343733. The reversal of 81343698 is 89634318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81343698 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81343697) 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 3 ways as a sum of consecutive naturals, for example, 6778636 + ... + 6778647.

It is an arithmetic number, because the mean of its divisors is an integer number (20335926).

Almost surely, 2^81343698 is an apocalyptic number.

81343698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81343698 is a wasteful number, since it uses less digits than its factorization.

81343698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557288.

The product of its digits is 124416, while the sum is 42.

The square root of 81343698 is about 9019.0741209949. The cubic root of 81343698 is about 433.2859807560.

The spelling of 81343698 in words is "eighty-one million, three hundred forty-three thousand, six hundred ninety-eight".