687555140 has 48 divisors (see below), whose sum is σ = 1540933632. Its totient is φ = 256790016.

The previous prime is 687555137. The next prime is 687555173. The reversal of 687555140 is 41555786.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35219 + ... + 51141.

It is an arithmetic number, because the mean of its divisors is an integer number (32102784).

Almost surely, 2^687555140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687555140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770466816).

687555140 is an abundant number, since it is smaller than the sum of its proper divisors (853378492).

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

687555140 is a wasteful number, since it uses less digits than its factorization.

687555140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16076 (or 16074 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 687555140 is about 26221.2726617150. The cubic root of 687555140 is about 882.6106787652.

The spelling of 687555140 in words is "six hundred eighty-seven million, five hundred fifty-five thousand, one hundred forty".