687982 has 8 divisors (see below), whose sum is σ = 1037952. Its totient is φ = 342000.

The previous prime is 687977. The next prime is 688003. The reversal of 687982 is 289786.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (129744).

2⁶⁸⁷⁹⁸² is an apocalyptic number.

687982 is a deficient number, since it is larger than the sum of its proper divisors (349970).

687982 is a wasteful number, since it uses less digits than its factorization.

687982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994.

The product of its digits is 48384, while the sum is 40.

The square root of 687982 is about 829.4468035986. The cubic root of 687982 is about 88.2793293575.

The spelling of 687982 in words is "six hundred eighty-seven thousand, nine hundred eighty-two".