688006944 has 36 divisors (see below), whose sum is σ = 1956520566. Its totient is φ = 229335552.

The previous prime is 688006931. The next prime is 688006961. The reversal of 688006944 is 449600886.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 674960400 + 13046544 = 25980^2 + 3612^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 688006944.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1194169 + ... + 1194744.

Almost surely, 2^688006944 is an apocalyptic number.

It is an amenable number.

688006944 is an abundant number, since it is smaller than the sum of its proper divisors (1268513622).

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

688006944 is a wasteful number, since it uses less digits than its factorization.

688006944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2388929 (or 2388918 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 688006944 is about 26229.8864656331. The cubic root of 688006944 is about 882.8039625221.

The spelling of 688006944 in words is "six hundred eighty-eight million, six thousand, nine hundred forty-four".