689598 has 48 divisors (see below), whose sum is σ = 1843296. Its totient is φ = 181440.

The previous prime is 689597. The next prime is 689599. The reversal of 689598 is 895986.

It is an interprime number because it is at equal distance from previous prime (689597) and next prime (689599).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1428 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (38402).

2⁶⁸⁹⁵⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921648).

689598 is an abundant number, since it is smaller than the sum of its proper divisors (1153698).

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

689598 is a wasteful number, since it uses less digits than its factorization.

689598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 446 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 689598 is about 830.4203754726. The cubic root of 689598 is about 88.3483950425.

The spelling of 689598 in words is "six hundred eighty-nine thousand, five hundred ninety-eight".