687371 has 4 divisors (see below), whose sum is σ = 691752. Its totient is φ = 682992.

The previous prime is 687359. The next prime is 687383. The reversal of 687371 is 173786.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (687359) and next prime (687383).

It is a cyclic number.

It is not a de Polignac number, because 687371 - 2⁶ = 687307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687311) 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 in 3 ways as a sum of consecutive naturals, for example, 1946 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (172938).

2⁶⁸⁷³⁷¹ is an apocalyptic number.

687371 is a deficient number, since it is larger than the sum of its proper divisors (4381).

687371 is a wasteful number, since it uses less digits than its factorization.

687371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380.

The product of its digits is 7056, while the sum is 32.

The square root of 687371 is about 829.0784040126. The cubic root of 687371 is about 88.2531878568.

The spelling of 687371 in words is "six hundred eighty-seven thousand, three hundred seventy-one".