687611 has 8 divisors (see below), whose sum is σ = 728448. Its totient is φ = 648000.

The previous prime is 687593. The next prime is 687623. The reversal of 687611 is 116786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687611 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 687611.

It is not an unprimeable number, because it can be changed into a prime (687641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (91056).

2⁶⁸⁷⁶¹¹ is an apocalyptic number.

687611 is a deficient number, since it is larger than the sum of its proper divisors (40837).

687611 is a wasteful number, since it uses less digits than its factorization.

687611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613.

The product of its digits is 2016, while the sum is 29.

The square root of 687611 is about 829.2231304058. The cubic root of 687611 is about 88.2634580508.

The spelling of 687611 in words is "six hundred eighty-seven thousand, six hundred eleven".