687683009 has 8 divisors (see below), whose sum is σ = 742010472. Its totient is φ = 633559680.

The previous prime is 687682987. The next prime is 687683027. The reversal of 687683009 is 900386786.

It can be written as a sum of positive squares in 4 ways, for example, as 14799409 + 672883600 = 3847^2 + 25940^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-687683009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687680009) 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, 43994 + ... + 57539.

It is an arithmetic number, because the mean of its divisors is an integer number (92751309).

Almost surely, 2^687683009 is an apocalyptic number.

It is an amenable number.

687683009 is a deficient number, since it is larger than the sum of its proper divisors (54327463).

687683009 is a wasteful number, since it uses less digits than its factorization.

687683009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102067.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 687683009 is about 26223.7108167399. The cubic root of 687683009 is about 882.6653902798.

The spelling of 687683009 in words is "six hundred eighty-seven million, six hundred eighty-three thousand, nine".