687856011 has 8 divisors (see below), whose sum is σ = 941929104. Its totient is φ = 446176800.

The previous prime is 687855997. The next prime is 687856019. The reversal of 687856011 is 110658786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687856011 - 2¹⁴ = 687839627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687856019) 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 7 ways as a sum of consecutive naturals, for example, 3098340 + ... + 3098561.

It is an arithmetic number, because the mean of its divisors is an integer number (117741138).

Almost surely, 2^687856011 is an apocalyptic number.

687856011 is a deficient number, since it is larger than the sum of its proper divisors (254073093).

687856011 is a wasteful number, since it uses less digits than its factorization.

687856011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196941.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 687856011 is about 26227.0091890021. The cubic root of 687856011 is about 882.7394021295.

The spelling of 687856011 in words is "six hundred eighty-seven million, eight hundred fifty-six thousand, eleven".