687286643 has 2 divisors, whose sum is σ = 687286644. Its totient is φ = 687286642.

The previous prime is 687286637. The next prime is 687286651. The reversal of 687286643 is 346682786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687286643 - 2²² = 683092339 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 687286591 and 687286600.

It is not a weakly prime, because it can be changed into another prime (687286043) 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, 343643321 + 343643322.

It is an arithmetic number, because the mean of its divisors is an integer number (343643322).

Almost surely, 2^687286643 is an apocalyptic number.

687286643 is a deficient number, since it is larger than the sum of its proper divisors (1).

687286643 is an equidigital number, since it uses as much as digits as its factorization.

687286643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 50.

The square root of 687286643 is about 26216.1523301952. The cubic root of 687286643 is about 882.4957744423.

The spelling of 687286643 in words is "six hundred eighty-seven million, two hundred eighty-six thousand, six hundred forty-three".