688647488 has 28 divisors (see below), whose sum is σ = 1376527092. Its totient is φ = 341806080.

The previous prime is 688647473. The next prime is 688647493. The reversal of 688647488 is 884746886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 504990784 + 183656704 = 22472^2 + 13552^2 .

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 3 ways as a sum of consecutive naturals, for example, 30503 + ... + 48038.

Almost surely, 2^688647488 is an apocalyptic number.

It is an amenable number.

688647488 is a deficient number, since it is larger than the sum of its proper divisors (687879604).

688647488 is a wasteful number, since it uses less digits than its factorization.

688647488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78690 (or 78680 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 59.

The square root of 688647488 is about 26242.0938189010. The cubic root of 688647488 is about 883.0778451181.

The spelling of 688647488 in words is "six hundred eighty-eight million, six hundred forty-seven thousand, four hundred eighty-eight".