688535746 has 8 divisors (see below), whose sum is σ = 1039382460. Its totient is φ = 342074928.

The previous prime is 688535741. The next prime is 688535747. The reversal of 688535746 is 647535886.

It can be written as a sum of positive squares in 2 ways, for example, as 688485121 + 50625 = 26239^2 + 225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 688535693 and 688535702.

It is not an unprimeable number, because it can be changed into a prime (688535741) 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 3 ways as a sum of consecutive naturals, for example, 1096081 + ... + 1096708.

Almost surely, 2^688535746 is an apocalyptic number.

688535746 is a deficient number, since it is larger than the sum of its proper divisors (350846714).

688535746 is a wasteful number, since it uses less digits than its factorization.

688535746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192948.

The product of its digits is 4838400, while the sum is 52.

The square root of 688535746 is about 26239.9646722323. The cubic root of 688535746 is about 883.0300789175.

The spelling of 688535746 in words is "six hundred eighty-eight million, five hundred thirty-five thousand, seven hundred forty-six".