687897 has 24 divisors (see below), whose sum is σ = 1160640. Its totient is φ = 384480.

The previous prime is 687893. The next prime is 687901. The reversal of 687897 is 798786.

It is an interprime number because it is at equal distance from previous prime (687893) and next prime (687901).

It is not a de Polignac number, because 687897 - 2² = 687893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3754 + ... + 3932.

It is an arithmetic number, because the mean of its divisors is an integer number (48360).

2⁶⁸⁷⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

687897 is a deficient number, since it is larger than the sum of its proper divisors (472743).

687897 is a wasteful number, since it uses less digits than its factorization.

687897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 250 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 687897 is about 829.3955630458. The cubic root of 687897 is about 88.2756935783.

Subtracting 687897 from its reverse (798786), we obtain a square (110889 = 333²).

The spelling of 687897 in words is "six hundred eighty-seven thousand, eight hundred ninety-seven".