687717105 has 16 divisors (see below), whose sum is σ = 1106498880. Its totient is φ = 364731968.

The previous prime is 687717101. The next prime is 687717131. The reversal of 687717105 is 501717786.

It is a cyclic number.

It is not a de Polignac number, because 687717105 - 2² = 687717101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687717101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125382 + ... + 130751.

It is an arithmetic number, because the mean of its divisors is an integer number (69156180).

Almost surely, 2^687717105 is an apocalyptic number.

It is an amenable number.

687717105 is a deficient number, since it is larger than the sum of its proper divisors (418781775).

687717105 is a wasteful number, since it uses less digits than its factorization.

687717105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256320.

The product of its (nonzero) digits is 82320, while the sum is 42.

The square root of 687717105 is about 26224.3609073701. The cubic root of 687717105 is about 882.6799778448.

The spelling of 687717105 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, one hundred five".