688441 has 4 divisors (see below), whose sum is σ = 741412. Its totient is φ = 635472.

The previous prime is 688433. The next prime is 688447. The reversal of 688441 is 144886.

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 42025 + 646416 = 205^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 688441 - 2³ = 688433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688447) 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, 26466 + ... + 26491.

It is an arithmetic number, because the mean of its divisors is an integer number (185353).

2⁶⁸⁸⁴⁴¹ is an apocalyptic number.

It is an amenable number.

688441 is a deficient number, since it is larger than the sum of its proper divisors (52971).

688441 is a wasteful number, since it uses less digits than its factorization.

688441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52970.

The product of its digits is 6144, while the sum is 31.

The square root of 688441 is about 829.7234479030. The cubic root of 688441 is about 88.2989573925.

The spelling of 688441 in words is "six hundred eighty-eight thousand, four hundred forty-one".