687699 has 12 divisors (see below), whose sum is σ = 1017016. Its totient is φ = 447552.

The previous prime is 687691. The next prime is 687707. The reversal of 687699 is 996786.

It is an interprime number because it is at equal distance from previous prime (687691) and next prime (687707).

It is not a de Polignac number, because 687699 - 2³ = 687691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 502 + ... + 1275.

2⁶⁸⁷⁶⁹⁹ is an apocalyptic number.

687699 is a deficient number, since it is larger than the sum of its proper divisors (329317).

687699 is a wasteful number, since it uses less digits than its factorization.

687699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1823 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 687699 is about 829.2761904215. The cubic root of 687699 is about 88.2672231898.

The spelling of 687699 in words is "six hundred eighty-seven thousand, six hundred ninety-nine".