689755 has 8 divisors (see below), whose sum is σ = 903024. Its totient is φ = 501600.

The previous prime is 689723. The next prime is 689761. The reversal of 689755 is 557986.

It is a happy number.

689755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689755 - 2⁵ = 689723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6216 + ... + 6325.

It is an arithmetic number, because the mean of its divisors is an integer number (112878).

2⁶⁸⁹⁷⁵⁵ is an apocalyptic number.

689755 is a deficient number, since it is larger than the sum of its proper divisors (213269).

689755 is a wasteful number, since it uses less digits than its factorization.

689755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12557.

The product of its digits is 75600, while the sum is 40.

The square root of 689755 is about 830.5149005286. The cubic root of 689755 is about 88.3550992603.

Subtracting from 689755 its reverse (557986), we obtain a square (131769 = 363²).

It can be divided in two parts, 689 and 755, that added together give a square (1444 = 38²).

The spelling of 689755 in words is "six hundred eighty-nine thousand, seven hundred fifty-five".