687058 has 4 divisors (see below), whose sum is σ = 1030590. Its totient is φ = 343528.

The previous prime is 687041. The next prime is 687061. The reversal of 687058 is 850786.

687058 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 850786 = 2 ⋅425393.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 149769 = 733^2 + 387^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171763 + ... + 171766.

2⁶⁸⁷⁰⁵⁸ is an apocalyptic number.

687058 is a deficient number, since it is larger than the sum of its proper divisors (343532).

687058 is a wasteful number, since it uses less digits than its factorization.

687058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343531.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 687058 is about 828.8896187069. The cubic root of 687058 is about 88.2397902197.

The spelling of 687058 in words is "six hundred eighty-seven thousand, fifty-eight".