687717005 has 16 divisors (see below), whose sum is σ = 839144448. Its totient is φ = 540960000.

The previous prime is 687716977. The next prime is 687717007. The reversal of 687717005 is 500717786.

It is not a de Polignac number, because 687717005 - 2¹⁸ = 687454861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687717007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139940 + ... + 144770.

It is an arithmetic number, because the mean of its divisors is an integer number (52446528).

Almost surely, 2^687717005 is an apocalyptic number.

It is an amenable number.

687717005 is a deficient number, since it is larger than the sum of its proper divisors (151427443).

687717005 is a wasteful number, since it uses less digits than its factorization.

687717005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 687717005 is about 26224.3590007459. The cubic root of 687717005 is about 882.6799350618.

The spelling of 687717005 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, five".