687655320 has 128 divisors (see below), whose sum is σ = 2257217280. Its totient is φ = 166208000.

The previous prime is 687655247. The next prime is 687655373. The reversal of 687655320 is 23556786.

687655320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 647590 + ... + 648650.

It is an arithmetic number, because the mean of its divisors is an integer number (17634510).

Almost surely, 2^687655320 is an apocalyptic number.

687655320 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 687655320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128608640).

687655320 is an abundant number, since it is smaller than the sum of its proper divisors (1569561960).

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

687655320 is a wasteful number, since it uses less digits than its factorization.

687655320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 687655320 is about 26223.1828731754. The cubic root of 687655320 is about 882.6535435182.

The spelling of 687655320 in words is "six hundred eighty-seven million, six hundred fifty-five thousand, three hundred twenty".