688746676 has 12 divisors (see below), whose sum is σ = 1214105508. Its totient is φ = 341859392.

The previous prime is 688746671. The next prime is 688746677. The reversal of 688746676 is 676647886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 602702500 + 86044176 = 24550^2 + 9276^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688746676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688746671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627871 + ... + 628966.

It is an arithmetic number, because the mean of its divisors is an integer number (101175459).

Almost surely, 2^688746676 is an apocalyptic number.

It is an amenable number.

688746676 is a deficient number, since it is larger than the sum of its proper divisors (525358832).

688746676 is a wasteful number, since it uses less digits than its factorization.

688746676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256978 (or 1256976 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 58.

The square root of 688746676 is about 26243.9836152974. The cubic root of 688746676 is about 883.1202405487.

The spelling of 688746676 in words is "six hundred eighty-eight million, seven hundred forty-six thousand, six hundred seventy-six".