687068601128 has 64 divisors (see below), whose sum is σ = 1586758239360. Its totient is φ = 271599019776.

The previous prime is 687068601127. The next prime is 687068601181. The reversal of 687068601128 is 821106860786.

It is a self number, because there is not a number n which added to its sum of digits gives 687068601128.

It is not an unprimeable number, because it can be changed into a prime (687068601127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590450 + ... + 1312542.

It is an arithmetic number, because the mean of its divisors is an integer number (24793097490).

Almost surely, 2^687068601128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687068601128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793379119680).

687068601128 is an abundant number, since it is smaller than the sum of its proper divisors (899689638232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687068601128 is a wasteful number, since it uses less digits than its factorization.

687068601128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723426 (or 723422 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 687068601128 in words is "six hundred eighty-seven billion, sixty-eight million, six hundred one thousand, one hundred twenty-eight".