689913005 has 4 divisors (see below), whose sum is σ = 827895612. Its totient is φ = 551930400.

The previous prime is 689913001. The next prime is 689913013. The reversal of 689913005 is 500319986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91278916 + 598634089 = 9554^2 + 24467^2 .

It is not a de Polignac number, because 689913005 - 2² = 689913001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689913001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68991296 + ... + 68991305.

It is an arithmetic number, because the mean of its divisors is an integer number (206973903).

Almost surely, 2^689913005 is an apocalyptic number.

It is an amenable number.

689913005 is a deficient number, since it is larger than the sum of its proper divisors (137982607).

689913005 is a wasteful number, since it uses less digits than its factorization.

689913005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137982606.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 689913005 is about 26266.1950994049. The cubic root of 689913005 is about 883.6184536659.

The spelling of 689913005 in words is "six hundred eighty-nine million, nine hundred thirteen thousand, five".