82640687 has 2 divisors, whose sum is σ = 82640688. Its totient is φ = 82640686.

The previous prime is 82640669. The next prime is 82640717. The reversal of 82640687 is 78604628.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82640687 - 2⁸ = 82640431 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 (82640287) 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, 41320343 + 41320344.

It is an arithmetic number, because the mean of its divisors is an integer number (41320344).

Almost surely, 2^82640687 is an apocalyptic number.

82640687 is a deficient number, since it is larger than the sum of its proper divisors (1).

82640687 is an equidigital number, since it uses as much as digits as its factorization.

82640687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 82640687 is about 9090.6923278703. The cubic root of 82640687 is about 435.5766993236.

The spelling of 82640687 in words is "eighty-two million, six hundred forty thousand, six hundred eighty-seven".