82640717 has 2 divisors, whose sum is σ = 82640718. Its totient is φ = 82640716.

The previous prime is 82640687. The next prime is 82640741. The reversal of 82640717 is 71704628.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 8491396 = 8611^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 82640717 - 2⁶ = 82640653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82642717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41320358 + 41320359.

It is an arithmetic number, because the mean of its divisors is an integer number (41320359).

Almost surely, 2^82640717 is an apocalyptic number.

It is an amenable number.

82640717 is a deficient number, since it is larger than the sum of its proper divisors (1).

82640717 is an equidigital number, since it uses as much as digits as its factorization.

82640717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 82640717 is about 9090.6939779095. The cubic root of 82640717 is about 435.5767520309.

The spelling of 82640717 in words is "eighty-two million, six hundred forty thousand, seven hundred seventeen".