82785643 has 2 divisors, whose sum is σ = 82785644. Its totient is φ = 82785642.

The previous prime is 82785589. The next prime is 82785649. The reversal of 82785643 is 34658728.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82785643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82785643.

It is not a weakly prime, because it can be changed into another prime (82785649) 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 as a sum of consecutive naturals, namely, 41392821 + 41392822.

It is an arithmetic number, because the mean of its divisors is an integer number (41392822).

Almost surely, 2^82785643 is an apocalyptic number.

82785643 is a deficient number, since it is larger than the sum of its proper divisors (1).

82785643 is an equidigital number, since it uses as much as digits as its factorization.

82785643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

The square root of 82785643 is about 9098.6616048735. The cubic root of 82785643 is about 435.8312251819.

The spelling of 82785643 in words is "eighty-two million, seven hundred eighty-five thousand, six hundred forty-three".