687958 has 8 divisors (see below), whose sum is σ = 1049040. Its totient is φ = 338280.

The previous prime is 687949. The next prime is 687961. The reversal of 687958 is 859786.

It is a happy number.

687958 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2698 + ... + 2941.

It is an arithmetic number, because the mean of its divisors is an integer number (131130).

2⁶⁸⁷⁹⁵⁸ is an apocalyptic number.

687958 is a deficient number, since it is larger than the sum of its proper divisors (361082).

687958 is a wasteful number, since it uses less digits than its factorization.

687958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5702.

The product of its digits is 120960, while the sum is 43.

The square root of 687958 is about 829.4323359985. The cubic root of 687958 is about 88.2783028149.

The spelling of 687958 in words is "six hundred eighty-seven thousand, nine hundred fifty-eight".