688489 has 4 divisors (see below), whose sum is σ = 712260. Its totient is φ = 664720.

The previous prime is 688477. The next prime is 688511. The reversal of 688489 is 984886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 577600 + 110889 = 760^2 + 333^2 .

It is a cyclic number.

It is not a de Polignac number, because 688489 - 2⁹ = 687977 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688889) 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, 11842 + ... + 11899.

It is an arithmetic number, because the mean of its divisors is an integer number (178065).

2⁶⁸⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

688489 is a deficient number, since it is larger than the sum of its proper divisors (23771).

688489 is a wasteful number, since it uses less digits than its factorization.

688489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23770.

The product of its digits is 110592, while the sum is 43.

The square root of 688489 is about 829.7523726992. The cubic root of 688489 is about 88.3010094935.

The spelling of 688489 in words is "six hundred eighty-eight thousand, four hundred eighty-nine".