687730809897 has 12 divisors (see below), whose sum is σ = 995534502144. Its totient is φ = 457496950680.

The previous prime is 687730809869. The next prime is 687730809907. The reversal of 687730809897 is 798908037786.

687730809897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 687730809897 - 2⁷ = 687730809769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687730809827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82516929 + ... + 82525262.

It is an arithmetic number, because the mean of its divisors is an integer number (82961208512).

Almost surely, 2^687730809897 is an apocalyptic number.

It is an amenable number.

687730809897 is a deficient number, since it is larger than the sum of its proper divisors (307803692247).

687730809897 is a wasteful number, since it uses less digits than its factorization.

687730809897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165042660 (or 165042657 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 72.

The spelling of 687730809897 in words is "six hundred eighty-seven billion, seven hundred thirty million, eight hundred nine thousand, eight hundred ninety-seven".