688244426 has 8 divisors (see below), whose sum is σ = 1036651044. Its totient is φ = 342694080.

The previous prime is 688244419. The next prime is 688244441. The reversal of 688244426 is 624442886.

It can be written as a sum of positive squares in 2 ways, for example, as 680949025 + 7295401 = 26095^2 + 2701^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 713465 + ... + 714428.

Almost surely, 2^688244426 is an apocalyptic number.

688244426 is a deficient number, since it is larger than the sum of its proper divisors (348406618).

688244426 is a wasteful number, since it uses less digits than its factorization.

688244426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428136.

The product of its digits is 589824, while the sum is 44.

The square root of 688244426 is about 26234.4130103953. The cubic root of 688244426 is about 882.9055244492.

The spelling of 688244426 in words is "six hundred eighty-eight million, two hundred forty-four thousand, four hundred twenty-six".