687136589 has 4 divisors (see below), whose sum is σ = 703896060. Its totient is φ = 670377120.

The previous prime is 687136561. The next prime is 687136621. The reversal of 687136589 is 985631786.

It is a happy number.

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 389746564 + 297390025 = 19742^2 + 17245^2 .

It is a cyclic number.

It is not a de Polignac number, because 687136589 - 2¹⁶ = 687071053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687136589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687136519) 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, 8379674 + ... + 8379755.

It is an arithmetic number, because the mean of its divisors is an integer number (175974015).

Almost surely, 2^687136589 is an apocalyptic number.

It is an amenable number.

687136589 is a deficient number, since it is larger than the sum of its proper divisors (16759471).

687136589 is a wasteful number, since it uses less digits than its factorization.

687136589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16759470.

The product of its digits is 2177280, while the sum is 53.

The square root of 687136589 is about 26213.2903123587. The cubic root of 687136589 is about 882.4315452202.

The spelling of 687136589 in words is "six hundred eighty-seven million, one hundred thirty-six thousand, five hundred eighty-nine".