687306987 has 6 divisors (see below), whose sum is σ = 992776772. Its totient is φ = 458204652.

The previous prime is 687306973. The next prime is 687307001. The reversal of 687306987 is 789603786.

It is an interprime number because it is at equal distance from previous prime (687306973) and next prime (687307001).

It is not a de Polignac number, because 687306987 - 2¹⁸ = 687044843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687306937) 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 in 5 ways as a sum of consecutive naturals, for example, 38183713 + ... + 38183730.

Almost surely, 2^687306987 is an apocalyptic number.

687306987 is a deficient number, since it is larger than the sum of its proper divisors (305469785).

687306987 is a wasteful number, since it uses less digits than its factorization.

687306987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76367449 (or 76367446 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 687306987 is about 26216.5403323932. The cubic root of 687306987 is about 882.5044817830.

The spelling of 687306987 in words is "six hundred eighty-seven million, three hundred six thousand, nine hundred eighty-seven".