689280 has 64 divisors (see below), whose sum is σ = 2203200. Its totient is φ = 183296.

The previous prime is 689279. The next prime is 689291. The reversal of 689280 is 82986.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741 + ... + 2099.

It is an arithmetic number, because the mean of its divisors is an integer number (34425).

2⁶⁸⁹²⁸⁰ is an apocalyptic number.

689280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101600).

689280 is an abundant number, since it is smaller than the sum of its proper divisors (1513920).

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

689280 is a wasteful number, since it uses less digits than its factorization.

689280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 689280 is about 830.2288841037. The cubic root of 689280 is about 88.3348126804.

It can be divided in two parts, 689 and 280, that added together give a palindrome (969).

The spelling of 689280 in words is "six hundred eighty-nine thousand, two hundred eighty".