687065 has 4 divisors (see below), whose sum is σ = 824484. Its totient is φ = 549648.

The previous prime is 687061. The next prime is 687073. The reversal of 687065 is 560786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 292681 + 394384 = 541^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 687065 - 2² = 687061 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687065.

It is not an unprimeable number, because it can be changed into a prime (687061) 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 in 3 ways as a sum of consecutive naturals, for example, 68702 + ... + 68711.

It is an arithmetic number, because the mean of its divisors is an integer number (206121).

2⁶⁸⁷⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

687065 is a deficient number, since it is larger than the sum of its proper divisors (137419).

687065 is a wasteful number, since it uses less digits than its factorization.

687065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137418.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 687065 is about 828.8938412125. The cubic root of 687065 is about 88.2400898918.

The spelling of 687065 in words is "six hundred eighty-seven thousand, sixty-five".