687758680 has 64 divisors (see below), whose sum is σ = 1784255040. Its totient is φ = 233705472.

The previous prime is 687758671. The next prime is 687758683. The reversal of 687758680 is 86857786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687758683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20772 + ... + 42508.

It is an arithmetic number, because the mean of its divisors is an integer number (27878985).

Almost surely, 2^687758680 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 687758680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892127520).

687758680 is an abundant number, since it is smaller than the sum of its proper divisors (1096496360).

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

687758680 is a wasteful number, since it uses less digits than its factorization.

687758680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21868 (or 21864 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The square root of 687758680 is about 26225.1535743835. The cubic root of 687758680 is about 882.6977645580.

The spelling of 687758680 in words is "six hundred eighty-seven million, seven hundred fifty-eight thousand, six hundred eighty".