688798944 has 96 divisors (see below), whose sum is σ = 2114784000. Its totient is φ = 217510272.

The previous prime is 688798937. The next prime is 688798973. The reversal of 688798944 is 449897886.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 4564 + ... + 37395.

It is an arithmetic number, because the mean of its divisors is an integer number (22029000).

Almost surely, 2^688798944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688798944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057392000).

688798944 is an abundant number, since it is smaller than the sum of its proper divisors (1425985056).

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

688798944 is a wasteful number, since it uses less digits than its factorization.

688798944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41997 (or 41983 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The square root of 688798944 is about 26244.9794055930. The cubic root of 688798944 is about 883.1425795609.

The spelling of 688798944 in words is "six hundred eighty-eight million, seven hundred ninety-eight thousand, nine hundred forty-four".