687680047 has 2 divisors, whose sum is σ = 687680048. Its totient is φ = 687680046.

The previous prime is 687680033. The next prime is 687680051. The reversal of 687680047 is 740086786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687680047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687679979 and 687680006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687680057) 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, 343840023 + 343840024.

It is an arithmetic number, because the mean of its divisors is an integer number (343840024).

Almost surely, 2^687680047 is an apocalyptic number.

687680047 is a deficient number, since it is larger than the sum of its proper divisors (1).

687680047 is an equidigital number, since it uses as much as digits as its factorization.

687680047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 687680047 is about 26223.6543410715. The cubic root of 687680047 is about 882.6641230009.

The spelling of 687680047 in words is "six hundred eighty-seven million, six hundred eighty thousand, forty-seven".