688520587289 has 4 divisors (see below), whose sum is σ = 729021798324. Its totient is φ = 648019376256.

The previous prime is 688520587273. The next prime is 688520587297. The reversal of 688520587289 is 982785025886.

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 410454204889 + 278066382400 = 640667^2 + 527320^2 .

It is a cyclic number.

It is not a de Polignac number, because 688520587289 - 2⁴ = 688520587273 is a prime.

It is a super-3 number, since 3×688520587289³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688520587219) 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, 20250605492 + ... + 20250605525.

It is an arithmetic number, because the mean of its divisors is an integer number (182255449581).

Almost surely, 2^688520587289 is an apocalyptic number.

It is an amenable number.

688520587289 is a deficient number, since it is larger than the sum of its proper divisors (40501211035).

688520587289 is a wasteful number, since it uses less digits than its factorization.

688520587289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40501211034.

The product of its (nonzero) digits is 154828800, while the sum is 68.

The spelling of 688520587289 in words is "six hundred eighty-eight billion, five hundred twenty million, five hundred eighty-seven thousand, two hundred eighty-nine".