688611824 has 20 divisors (see below), whose sum is σ = 1350262536. Its totient is φ = 340156992.

The previous prime is 688611811. The next prime is 688611829. The reversal of 688611824 is 428116886.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688611829) by changing a digit.

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, 257939 + ... + 260594.

Almost surely, 2^688611824 is an apocalyptic number.

It is an amenable number.

688611824 is a deficient number, since it is larger than the sum of its proper divisors (661650712).

688611824 is a wasteful number, since it uses less digits than its factorization.

688611824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518624 (or 518618 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 688611824 is about 26241.4142911544. The cubic root of 688611824 is about 883.0626004380.

The spelling of 688611824 in words is "six hundred eighty-eight million, six hundred eleven thousand, eight hundred twenty-four".