687859568 has 40 divisors (see below), whose sum is σ = 1458589680. Its totient is φ = 311651840.

The previous prime is 687859567. The next prime is 687859577. The reversal of 687859568 is 865958786.

It is a self number, because there is not a number n which added to its sum of digits gives 687859568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687859567) 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, 49628 + ... + 61956.

It is an arithmetic number, because the mean of its divisors is an integer number (36464742).

Almost surely, 2^687859568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687859568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729294840).

687859568 is an abundant number, since it is smaller than the sum of its proper divisors (770730112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687859568 is a wasteful number, since it uses less digits than its factorization.

687859568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12665 (or 12659 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 62.

The square root of 687859568 is about 26227.0770006877. The cubic root of 687859568 is about 882.7409237166.

The spelling of 687859568 in words is "six hundred eighty-seven million, eight hundred fifty-nine thousand, five hundred sixty-eight".