687861608 has 24 divisors (see below), whose sum is σ = 1500311250. Its totient is φ = 294797664.

The previous prime is 687861593. The next prime is 687861619. The reversal of 687861608 is 806168786.

It can be written as a sum of positive squares in only one way, i.e., 687593284 + 268324 = 26222^2 + 518^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 876983 + ... + 877766.

Almost surely, 2^687861608 is an apocalyptic number.

It is an amenable number.

687861608 is an abundant number, since it is smaller than the sum of its proper divisors (812449642).

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

687861608 is a wasteful number, since it uses less digits than its factorization.

687861608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754769 (or 1754758 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 687861608 is about 26227.1158917636. The cubic root of 687861608 is about 882.7417963704.

It can be divided in two parts, 6878 and 61608, that added together give a palindrome (68486).

The spelling of 687861608 in words is "six hundred eighty-seven million, eight hundred sixty-one thousand, six hundred eight".