687158 has 4 divisors (see below), whose sum is σ = 1030740. Its totient is φ = 343578.

The previous prime is 687151. The next prime is 687161. The reversal of 687158 is 851786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×687158² = 944372233928, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687158.

It is not an unprimeable number, because it can be changed into a prime (687151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171788 + ... + 171791.

It is an arithmetic number, because the mean of its divisors is an integer number (257685).

2⁶⁸⁷¹⁵⁸ is an apocalyptic number.

687158 is a deficient number, since it is larger than the sum of its proper divisors (343582).

687158 is a wasteful number, since it uses less digits than its factorization.

687158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343581.

The product of its digits is 13440, while the sum is 35.

The square root of 687158 is about 828.9499381748. The cubic root of 687158 is about 88.2440710572.

The spelling of 687158 in words is "six hundred eighty-seven thousand, one hundred fifty-eight".