687112 has 8 divisors (see below), whose sum is σ = 1288350. Its totient is φ = 343552.

The previous prime is 687109. The next prime is 687121. The reversal of 687112 is 211786.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 285156 = 634^2 + 534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42937 + ... + 42952.

2⁶⁸⁷¹¹² is an apocalyptic number.

It is an amenable number.

687112 is a deficient number, since it is larger than the sum of its proper divisors (601238).

687112 is a wasteful number, since it uses less digits than its factorization.

687112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85895 (or 85891 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 687112 is about 828.9221917647. The cubic root of 687112 is about 88.2421019235.

Adding to 687112 its reverse (211786), we get a palindrome (898898).

The spelling of 687112 in words is "six hundred eighty-seven thousand, one hundred twelve".