687976 has 16 divisors (see below), whose sum is σ = 1346400. Its totient is φ = 328944.

The previous prime is 687961. The next prime is 687977. The reversal of 687976 is 679786.

687976 = T₂₃₃ + T₂₃₄ + ... + T₂₅₅.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686 + ... + 2053.

It is an arithmetic number, because the mean of its divisors is an integer number (84150).

2⁶⁸⁷⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

687976 is a deficient number, since it is larger than the sum of its proper divisors (658424).

687976 is a wasteful number, since it uses less digits than its factorization.

687976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3768 (or 3764 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 687976 is about 829.4431867223. The cubic root of 687976 is about 88.2790727241.

The spelling of 687976 in words is "six hundred eighty-seven thousand, nine hundred seventy-six".