687135 has 16 divisors (see below), whose sum is σ = 1157760. Its totient is φ = 347040.

The previous prime is 687131. The next prime is 687139. The reversal of 687135 is 531786.

It is an interprime number because it is at equal distance from previous prime (687131) and next prime (687139).

It is not a de Polignac number, because 687135 - 2² = 687131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 921 + ... + 1490.

It is an arithmetic number, because the mean of its divisors is an integer number (72360).

2⁶⁸⁷¹³⁵ is an apocalyptic number.

687135 is a deficient number, since it is larger than the sum of its proper divisors (470625).

687135 is a wasteful number, since it uses less digits than its factorization.

687135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438.

The product of its digits is 5040, while the sum is 30.

The square root of 687135 is about 828.9360650858. The cubic root of 687135 is about 88.2430865013.

The spelling of 687135 in words is "six hundred eighty-seven thousand, one hundred thirty-five".