687716 has 6 divisors (see below), whose sum is σ = 1203510. Its totient is φ = 343856.

The previous prime is 687707. The next prime is 687721. The reversal of 687716 is 617786.

It can be written as a sum of positive squares in only one way, i.e., 417316 + 270400 = 646^2 + 520^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687716.

It is an unprimeable number.

687716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85961 + ... + 85968.

It is an arithmetic number, because the mean of its divisors is an integer number (200585).

2⁶⁸⁷⁷¹⁶ is an apocalyptic number.

It is an amenable number.

687716 is a deficient number, since it is larger than the sum of its proper divisors (515794).

687716 is a wasteful number, since it uses less digits than its factorization.

687716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171933 (or 171931 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 687716 is about 829.2864402605. The cubic root of 687716 is about 88.2679505091.

The spelling of 687716 in words is "six hundred eighty-seven thousand, seven hundred sixteen".