81935705 has 8 divisors (see below), whose sum is σ = 98377152. Its totient is φ = 65512368.

The previous prime is 81935669. The next prime is 81935743. The reversal of 81935705 is 50753918.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81935705 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, 9242 + ... + 15788.

It is an arithmetic number, because the mean of its divisors is an integer number (12297144).

Almost surely, 2^81935705 is an apocalyptic number.

It is an amenable number.

81935705 is a deficient number, since it is larger than the sum of its proper divisors (16441447).

81935705 is a wasteful number, since it uses less digits than its factorization.

81935705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9055.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 81935705 is about 9051.8343444851. The cubic root of 81935705 is about 434.3345707416.

The spelling of 81935705 in words is "eighty-one million, nine hundred thirty-five thousand, seven hundred five".