687707956 has 24 divisors (see below), whose sum is σ = 1312478720. Its totient is φ = 313384032.

The previous prime is 687707941. The next prime is 687707957. The reversal of 687707956 is 659707786.

It is a junction number, because it is equal to n+sod(n) for n = 687707897 and 687707906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687707957) 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 in 7 ways as a sum of consecutive naturals, for example, 79596 + ... + 87811.

Almost surely, 2^687707956 is an apocalyptic number.

It is an amenable number.

687707956 is a deficient number, since it is larger than the sum of its proper divisors (624770764).

687707956 is a wasteful number, since it uses less digits than its factorization.

687707956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167503 (or 167501 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 55.

The square root of 687707956 is about 26224.1864697458. The cubic root of 687707956 is about 882.6760636022.

The spelling of 687707956 in words is "six hundred eighty-seven million, seven hundred seven thousand, nine hundred fifty-six".