689241985 has 8 divisors (see below), whose sum is σ = 855610920. Its totient is φ = 532379904.

The previous prime is 689241979. The next prime is 689242007. The reversal of 689241985 is 589142986.

689241985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 174451264 + 514790721 = 13208^2 + 22689^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 689241985 - 2³ = 689241977 is a prime.

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, 2376552 + ... + 2376841.

It is an arithmetic number, because the mean of its divisors is an integer number (106951365).

Almost surely, 2^689241985 is an apocalyptic number.

It is an amenable number.

689241985 is a deficient number, since it is larger than the sum of its proper divisors (166368935).

689241985 is a wasteful number, since it uses less digits than its factorization.

689241985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4753427.

The product of its digits is 1244160, while the sum is 52.

The square root of 689241985 is about 26253.4185393065. The cubic root of 689241985 is about 883.3318871065.

The spelling of 689241985 in words is "six hundred eighty-nine million, two hundred forty-one thousand, nine hundred eighty-five".