687946649786 has 16 divisors (see below), whose sum is σ = 1136058691680. Its totient is φ = 309834186480.

The previous prime is 687946649729. The next prime is 687946649837.

687946649786 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 687946649786.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143439356 + ... + 143444151.

It is an arithmetic number, because the mean of its divisors is an integer number (71003668230).

Almost surely, 2^687946649786 is an apocalyptic number.

687946649786 is a deficient number, since it is larger than the sum of its proper divisors (448112041894).

687946649786 is a wasteful number, since it uses less digits than its factorization.

687946649786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286883629.

The product of its digits is 5267275776, while the sum is 80.

The spelling of 687946649786 in words is "six hundred eighty-seven billion, nine hundred forty-six million, six hundred forty-nine thousand, seven hundred eighty-six".