82640843 has 2 divisors, whose sum is σ = 82640844. Its totient is φ = 82640842.

The previous prime is 82640827. The next prime is 82640851. The reversal of 82640843 is 34804628.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82640843 - 2⁴ = 82640827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (82640813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41320421 + 41320422.

It is an arithmetic number, because the mean of its divisors is an integer number (41320422).

Almost surely, 2^82640843 is an apocalyptic number.

82640843 is a deficient number, since it is larger than the sum of its proper divisors (1).

82640843 is an equidigital number, since it uses as much as digits as its factorization.

82640843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 82640843 is about 9090.7009080708. The cubic root of 82640843 is about 435.5769734014.

The spelling of 82640843 in words is "eighty-two million, six hundred forty thousand, eight hundred forty-three".