687546568 has 8 divisors (see below), whose sum is σ = 1289149830. Its totient is φ = 343773280.

The previous prime is 687546547. The next prime is 687546569. The reversal of 687546568 is 865645786.

It can be written as a sum of positive squares in only one way, i.e., 485849764 + 201696804 = 22042^2 + 14202^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (687546569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42971653 + ... + 42971668.

Almost surely, 2^687546568 is an apocalyptic number.

It is an amenable number.

687546568 is a deficient number, since it is larger than the sum of its proper divisors (601603262).

687546568 is a wasteful number, since it uses less digits than its factorization.

687546568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85943327 (or 85943323 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 55.

The square root of 687546568 is about 26221.1092061339. The cubic root of 687546568 is about 882.6070108072.

The spelling of 687546568 in words is "six hundred eighty-seven million, five hundred forty-six thousand, five hundred sixty-eight".