688473589 has 4 divisors (see below), whose sum is σ = 688644460. Its totient is φ = 688302720.

The previous prime is 688473571. The next prime is 688473613. The reversal of 688473589 is 985374886.

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 425060689 + 263412900 = 20617^2 + 16230^2 .

It is a cyclic number.

It is not a de Polignac number, because 688473589 - 2⁵ = 688473557 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 (688473889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79242 + ... + 87499.

It is an arithmetic number, because the mean of its divisors is an integer number (172161115).

Almost surely, 2^688473589 is an apocalyptic number.

It is an amenable number.

688473589 is a deficient number, since it is larger than the sum of its proper divisors (170871).

688473589 is a wasteful number, since it uses less digits than its factorization.

688473589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170870.

The product of its digits is 11612160, while the sum is 58.

The square root of 688473589 is about 26238.7802498516. The cubic root of 688473589 is about 883.0035065124.

The spelling of 688473589 in words is "six hundred eighty-eight million, four hundred seventy-three thousand, five hundred eighty-nine".