688698 has 12 divisors (see below), whose sum is σ = 1492218. Its totient is φ = 229560.

The previous prime is 688697. The next prime is 688717. The reversal of 688698 is 896886.

It can be written as a sum of positive squares in only one way, i.e., 431649 + 257049 = 657^2 + 507^2 .

It is not an unprimeable number, because it can be changed into a prime (688697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19113 + ... + 19148.

2⁶⁸⁸⁶⁹⁸ is an apocalyptic number.

688698 is an abundant number, since it is smaller than the sum of its proper divisors (803520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688698 is a wasteful number, since it uses less digits than its factorization.

688698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38269 (or 38266 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 688698 is about 829.8783043314. The cubic root of 688698 is about 88.3099435718.

The spelling of 688698 in words is "six hundred eighty-eight thousand, six hundred ninety-eight".