687115 has 24 divisors (see below), whose sum is σ = 1000944. Its totient is φ = 446400.

The previous prime is 687109. The next prime is 687121. The reversal of 687115 is 511786.

It is a happy number.

687115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (687109) and next prime (687121).

It is not a de Polignac number, because 687115 - 2³ = 687107 is a prime.

It is a Duffinian number.

Its product of digits (1680) is a multiple of the sum of its prime divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22150 + ... + 22180.

It is an arithmetic number, because the mean of its divisors is an integer number (41706).

2⁶⁸⁷¹¹⁵ is an apocalyptic number.

687115 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

687115 is a deficient number, since it is larger than the sum of its proper divisors (313829).

687115 is a wasteful number, since it uses less digits than its factorization.

687115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 60 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 687115 is about 828.9240013415. The cubic root of 687115 is about 88.2422303480.

It can be divided in two parts, 6871 and 15, that added together give a palindrome (6886).

The spelling of 687115 in words is "six hundred eighty-seven thousand, one hundred fifteen".