687815975879 has 8 divisors (see below), whose sum is σ = 729357884640. Its totient is φ = 646394305536.

The previous prime is 687815975863. The next prime is 687815975881. The reversal of 687815975879 is 978579518786.

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

It is a cyclic number.

It is not a de Polignac number, because 687815975879 - 2⁴ = 687815975863 is a prime.

It is a super-2 number, since 2×687815975879² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687815975809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30047819 + ... + 30070700.

It is an arithmetic number, because the mean of its divisors is an integer number (91169735580).

Almost surely, 2^687815975879 is an apocalyptic number.

687815975879 is a deficient number, since it is larger than the sum of its proper divisors (41541908761).

687815975879 is a wasteful number, since it uses less digits than its factorization.

687815975879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60119209.

The product of its digits is 2133734400, while the sum is 80.

The spelling of 687815975879 in words is "six hundred eighty-seven billion, eight hundred fifteen million, nine hundred seventy-five thousand, eight hundred seventy-nine".