670001687 has 2 divisors, whose sum is σ = 670001688. Its totient is φ = 670001686.

The previous prime is 670001677. The next prime is 670001711. The reversal of 670001687 is 786100076.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 670001687 - 2¹⁰ = 670000663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670001677) 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, 335000843 + 335000844.

It is an arithmetic number, because the mean of its divisors is an integer number (335000844).

Almost surely, 2^670001687 is an apocalyptic number.

670001687 is a deficient number, since it is larger than the sum of its proper divisors (1).

670001687 is an equidigital number, since it uses as much as digits as its factorization.

670001687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 670001687 is about 25884.3907983170. The cubic root of 670001687 is about 875.0347467018.

The spelling of 670001687 in words is "six hundred seventy million, one thousand, six hundred eighty-seven".