82620809 has 2 divisors, whose sum is σ = 82620810. Its totient is φ = 82620808.

The previous prime is 82620787. The next prime is 82620823. The reversal of 82620809 is 90802628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77933584 + 4687225 = 8828^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 82620809 - 2⁸ = 82620553 is a prime.

It is not a weakly prime, because it can be changed into another prime (82620869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41310404 + 41310405.

It is an arithmetic number, because the mean of its divisors is an integer number (41310405).

Almost surely, 2^82620809 is an apocalyptic number.

It is an amenable number.

82620809 is a deficient number, since it is larger than the sum of its proper divisors (1).

82620809 is an equidigital number, since it uses as much as digits as its factorization.

82620809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 82620809 is about 9089.5989460482. The cubic root of 82620809 is about 435.5417726701.

The spelling of 82620809 in words is "eighty-two million, six hundred twenty thousand, eight hundred nine".