687535 has 4 divisors (see below), whose sum is σ = 825048. Its totient is φ = 550024.

The previous prime is 687523. The next prime is 687541. The reversal of 687535 is 535786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 535786 = 2 ⋅267893.

It is a cyclic number.

It is not a de Polignac number, because 687535 - 2⁹ = 687023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68749 + ... + 68758.

It is an arithmetic number, because the mean of its divisors is an integer number (206262).

2⁶⁸⁷⁵³⁵ is an apocalyptic number.

687535 is a deficient number, since it is larger than the sum of its proper divisors (137513).

687535 is a wasteful number, since it uses less digits than its factorization.

687535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137512.

The product of its digits is 25200, while the sum is 34.

The square root of 687535 is about 829.1773031144. The cubic root of 687535 is about 88.2602060813.

The spelling of 687535 in words is "six hundred eighty-seven thousand, five hundred thirty-five".