688687500 has 84 divisors (see below), whose sum is σ = 2009193032. Its totient is φ = 183600000.

The previous prime is 688687469. The next prime is 688687513. The reversal of 688687500 is 5786886.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 688687500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 185664 + ... + 189336.

Almost surely, 2^688687500 is an apocalyptic number.

688687500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688687500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004596516).

688687500 is an abundant number, since it is smaller than the sum of its proper divisors (1320505532).

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

688687500 is an equidigital number, since it uses as much as digits as its factorization.

688687500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710 (or 3683 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 688687500 is about 26242.8561707753. The cubic root of 688687500 is about 883.0949477369.

The spelling of 688687500 in words is "six hundred eighty-eight million, six hundred eighty-seven thousand, five hundred".