687317280 has 192 divisors, whose sum is σ = 2433473280. Its totient is φ = 161796096.

The previous prime is 687317263. The next prime is 687317287. The reversal of 687317280 is 82713786.

It is not an unprimeable number, because it can be changed into a prime (687317287) 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 31 ways as a sum of consecutive naturals, for example, 141126 + ... + 145914.

It is an arithmetic number, because the mean of its divisors is an integer number (12674340).

Almost surely, 2^687317280 is an apocalyptic number.

687317280 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 687317280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216736640).

687317280 is an abundant number, since it is smaller than the sum of its proper divisors (1746156000).

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

687317280 is a wasteful number, since it uses less digits than its factorization.

687317280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 687317280 is about 26216.7366390251. The cubic root of 687317280 is about 882.5088871765.

The spelling of 687317280 in words is "six hundred eighty-seven million, three hundred seventeen thousand, two hundred eighty".