687265085 has 8 divisors (see below), whose sum is σ = 888158040. Its totient is φ = 507518784.

The previous prime is 687265081. The next prime is 687265091. The reversal of 687265085 is 580562786.

It can be written as a sum of positive squares in 4 ways, for example, as 3024121 + 684240964 = 1739^2 + 26158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687265085 - 2² = 687265081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687265081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5286590 + ... + 5286719.

It is an arithmetic number, because the mean of its divisors is an integer number (111019755).

Almost surely, 2^687265085 is an apocalyptic number.

687265085 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

687265085 is a deficient number, since it is larger than the sum of its proper divisors (200892955).

687265085 is a wasteful number, since it uses less digits than its factorization.

687265085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10573327.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 687265085 is about 26215.7411682371. The cubic root of 687265085 is about 882.4865473156.

The spelling of 687265085 in words is "six hundred eighty-seven million, two hundred sixty-five thousand, eighty-five".