687705240 has 128 divisors (see below), whose sum is σ = 2141798400. Its totient is φ = 176463360.

The previous prime is 687705223. The next prime is 687705331. The reversal of 687705240 is 42507786.

687705240 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, 829146 + ... + 829974.

It is an arithmetic number, because the mean of its divisors is an integer number (16732800).

Almost surely, 2^687705240 is an apocalyptic number.

687705240 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 687705240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1070899200).

687705240 is an abundant number, since it is smaller than the sum of its proper divisors (1454093160).

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

687705240 is a wasteful number, since it uses less digits than its factorization.

687705240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 687705240 is about 26224.1346854381. The cubic root of 687705240 is about 882.6749016015.

The spelling of 687705240 in words is "six hundred eighty-seven million, seven hundred five thousand, two hundred forty".