81682735 has 4 divisors (see below), whose sum is σ = 98019288. Its totient is φ = 65346184.

The previous prime is 81682709. The next prime is 81682751. The reversal of 81682735 is 53728618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81682735 - 2⁵ = 81682703 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8168269 + ... + 8168278.

It is an arithmetic number, because the mean of its divisors is an integer number (24504822).

Almost surely, 2^81682735 is an apocalyptic number.

81682735 is a deficient number, since it is larger than the sum of its proper divisors (16336553).

81682735 is a wasteful number, since it uses less digits than its factorization.

81682735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16336552.

The product of its digits is 80640, while the sum is 40.

The square root of 81682735 is about 9037.8501315302. The cubic root of 81682735 is about 433.8871187381.

The spelling of 81682735 in words is "eighty-one million, six hundred eighty-two thousand, seven hundred thirty-five".