687974 has 16 divisors (see below), whose sum is σ = 1190688. Its totient is φ = 292032.

The previous prime is 687961. The next prime is 687977. The reversal of 687974 is 479786.

687974 is nontrivially palindromic in base 13.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687977) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2042 + ... + 2354.

It is an arithmetic number, because the mean of its divisors is an integer number (74418).

2⁶⁸⁷⁹⁷⁴ is an apocalyptic number.

687974 is a deficient number, since it is larger than the sum of its proper divisors (502714).

687974 is a wasteful number, since it uses less digits than its factorization.

687974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 84672, while the sum is 41.

The square root of 687974 is about 829.4419810933. The cubic root of 687974 is about 88.2789871793.

It can be divided in two parts, 687 and 974, that added together give a palindrome (1661).

The spelling of 687974 in words is "six hundred eighty-seven thousand, nine hundred seventy-four".