82785691 has 8 divisors (see below), whose sum is σ = 85953600. Its totient is φ = 79638720.

The previous prime is 82785649. The next prime is 82785697. The reversal of 82785691 is 19658728.

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 82785691 - 2⁹ = 82785179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82785697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 13228.

It is an arithmetic number, because the mean of its divisors is an integer number (10744200).

Almost surely, 2^82785691 is an apocalyptic number.

82785691 is a deficient number, since it is larger than the sum of its proper divisors (3167909).

82785691 is a wasteful number, since it uses less digits than its factorization.

82785691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10469.

The product of its digits is 241920, while the sum is 46.

The square root of 82785691 is about 9098.6642426237. The cubic root of 82785691 is about 435.8313094150.

The spelling of 82785691 in words is "eighty-two million, seven hundred eighty-five thousand, six hundred ninety-one".