687975 has 12 divisors (see below), whose sum is σ = 1137576. Its totient is φ = 366880.

The previous prime is 687961. The next prime is 687977. The reversal of 687975 is 579786.

It is not a de Polignac number, because 687975 - 2⁷ = 687847 is a prime.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 4512 + ... + 4661.

It is an arithmetic number, because the mean of its divisors is an integer number (94798).

2⁶⁸⁷⁹⁷⁵ is an apocalyptic number.

687975 is a deficient number, since it is larger than the sum of its proper divisors (449601).

687975 is a wasteful number, since it uses less digits than its factorization.

687975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186 (or 9181 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 687975 is about 829.4425839080. The cubic root of 687975 is about 88.2790299517.

The spelling of 687975 in words is "six hundred eighty-seven thousand, nine hundred seventy-five".