81343705 has 8 divisors (see below), whose sum is σ = 97667712. Its totient is φ = 65038128.

The previous prime is 81343697. The next prime is 81343733. The reversal of 81343705 is 50734318.

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

It is a cyclic number.

It is not a de Polignac number, because 81343705 - 2³ = 81343697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8502 + ... + 15328.

It is an arithmetic number, because the mean of its divisors is an integer number (12208464).

Almost surely, 2^81343705 is an apocalyptic number.

It is an amenable number.

81343705 is a deficient number, since it is larger than the sum of its proper divisors (16324007).

81343705 is a wasteful number, since it uses less digits than its factorization.

81343705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 81343705 is about 9019.0745090613. The cubic root of 81343705 is about 433.2859931848.

The spelling of 81343705 in words is "eighty-one million, three hundred forty-three thousand, seven hundred five".