689011857 has 12 divisors (see below), whose sum is σ = 995488260. Its totient is φ = 459226368.

The previous prime is 689011793. The next prime is 689011861. The reversal of 689011857 is 758110986.

It can be written as a sum of positive squares in 2 ways, for example, as 679957776 + 9054081 = 26076^2 + 3009^2 .

It is not a de Polignac number, because 689011857 - 2⁶ = 689011793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689011867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44473 + ... + 57929.

It is an arithmetic number, because the mean of its divisors is an integer number (82957355).

Almost surely, 2^689011857 is an apocalyptic number.

It is an amenable number.

689011857 is a deficient number, since it is larger than the sum of its proper divisors (306476403).

689011857 is a wasteful number, since it uses less digits than its factorization.

689011857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19152 (or 19149 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 689011857 is about 26249.0353537040. The cubic root of 689011857 is about 883.2335655527.

The spelling of 689011857 in words is "six hundred eighty-nine million, eleven thousand, eight hundred fifty-seven".