687505 has 16 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 434880.

The previous prime is 687499. The next prime is 687517. The reversal of 687505 is 505786.

It is not a de Polignac number, because 687505 - 2⁵ = 687473 is a prime.

It is a congruent number.

It is an unprimeable 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 in 15 ways as a sum of consecutive naturals, for example, 301 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2⁶⁸⁷⁵⁰⁵ is an apocalyptic number.

687505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

687505 is a deficient number, since it is larger than the sum of its proper divisors (328559).

687505 is a wasteful number, since it uses less digits than its factorization.

687505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 687505 is about 829.1592126968. The cubic root of 687505 is about 88.2589223431.

The spelling of 687505 in words is "six hundred eighty-seven thousand, five hundred five".