687055585 has 4 divisors (see below), whose sum is σ = 824466708. Its totient is φ = 549644464.

The previous prime is 687055583. The next prime is 687055613. The reversal of 687055585 is 585550786.

It is a happy number.

687055585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 585550786 = 2 ⋅292775393.

It can be written as a sum of positive squares in 2 ways, for example, as 178462881 + 508592704 = 13359^2 + 22552^2 .

It is a cyclic number.

It is not a de Polignac number, because 687055585 - 2¹ = 687055583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687055583) 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, 68705554 + ... + 68705563.

It is an arithmetic number, because the mean of its divisors is an integer number (206116677).

Almost surely, 2^687055585 is an apocalyptic number.

It is an amenable number.

687055585 is a deficient number, since it is larger than the sum of its proper divisors (137411123).

687055585 is a wasteful number, since it uses less digits than its factorization.

687055585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137411122.

The product of its (nonzero) digits is 1680000, while the sum is 49.

The square root of 687055585 is about 26211.7451727274. The cubic root of 687055585 is about 882.3968683233.

The spelling of 687055585 in words is "six hundred eighty-seven million, fifty-five thousand, five hundred eighty-five".