688138263256 has 32 divisors (see below), whose sum is σ = 1367036954640. Its totient is φ = 323621152768.

The previous prime is 688138263217. The next prime is 688138263257. The reversal of 688138263256 is 652362831886.

It is a self number, because there is not a number n which added to its sum of digits gives 688138263256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688138263257) 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, 1417846 + ... + 1840261.

Almost surely, 2^688138263256 is an apocalyptic number.

It is an amenable number.

688138263256 is a deficient number, since it is larger than the sum of its proper divisors (678898691384).

688138263256 is a wasteful number, since it uses less digits than its factorization.

688138263256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259683 (or 3259679 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 58.

The spelling of 688138263256 in words is "six hundred eighty-eight billion, one hundred thirty-eight million, two hundred sixty-three thousand, two hundred fifty-six".