687489830681 has 8 divisors (see below), whose sum is σ = 723690518400. Its totient is φ = 651290844240.

The previous prime is 687489830653. The next prime is 687489830689. The reversal of 687489830681 is 186038984786.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687489830681 is a prime.

It is a super-2 number, since 2×687489830681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687489830689) 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, 450416 + ... + 1256126.

It is an arithmetic number, because the mean of its divisors is an integer number (90461314800).

Almost surely, 2^687489830681 is an apocalyptic number.

It is an amenable number.

687489830681 is a deficient number, since it is larger than the sum of its proper divisors (36200687719).

687489830681 is a wasteful number, since it uses less digits than its factorization.

687489830681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850639.

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 687489830681 in words is "six hundred eighty-seven billion, four hundred eighty-nine million, eight hundred thirty thousand, six hundred eighty-one".