687868851 has 8 divisors (see below), whose sum is σ = 917360640. Its totient is φ = 458478152.

The previous prime is 687868759. The next prime is 687868859. The reversal of 687868851 is 158868786.

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 687868851 - 2¹⁰ = 687867827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687868791 and 687868800.

It is not an unprimeable number, because it can be changed into a prime (687868859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7635 + ... + 37868.

It is an arithmetic number, because the mean of its divisors is an integer number (114670080).

Almost surely, 2^687868851 is an apocalyptic number.

687868851 is a deficient number, since it is larger than the sum of its proper divisors (229491789).

687868851 is a wasteful number, since it uses less digits than its factorization.

687868851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50545.

The product of its digits is 5160960, while the sum is 57.

The square root of 687868851 is about 26227.2539736817. The cubic root of 687868851 is about 882.7448947051.

The spelling of 687868851 in words is "six hundred eighty-seven million, eight hundred sixty-eight thousand, eight hundred fifty-one".