687374 has 4 divisors (see below), whose sum is σ = 1031064. Its totient is φ = 343686.

The previous prime is 687359. The next prime is 687383. The reversal of 687374 is 473786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 473786 = 2 ⋅236893.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

687374 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 171842 + ... + 171845.

It is an arithmetic number, because the mean of its divisors is an integer number (257766).

2⁶⁸⁷³⁷⁴ is an apocalyptic number.

687374 is a deficient number, since it is larger than the sum of its proper divisors (343690).

687374 is a wasteful number, since it uses less digits than its factorization.

687374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343689.

The product of its digits is 28224, while the sum is 35.

The square root of 687374 is about 829.0802132484. The cubic root of 687374 is about 88.2533162490.

The spelling of 687374 in words is "six hundred eighty-seven thousand, three hundred seventy-four".