81760065 has 8 divisors (see below), whose sum is σ = 130816128. Its totient is φ = 43605360.

The previous prime is 81760037. The next prime is 81760087. The reversal of 81760065 is 56006718.

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

It is not a de Polignac number, because 81760065 - 2¹² = 81755969 is a prime.

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, 2725321 + ... + 2725350.

It is an arithmetic number, because the mean of its divisors is an integer number (16352016).

Almost surely, 2^81760065 is an apocalyptic number.

It is an amenable number.

81760065 is a deficient number, since it is larger than the sum of its proper divisors (49056063).

81760065 is a wasteful number, since it uses less digits than its factorization.

81760065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450679.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 81760065 is about 9042.1272386535. The cubic root of 81760065 is about 434.0239975546.

The spelling of 81760065 in words is "eighty-one million, seven hundred sixty thousand, sixty-five".