686871888 has 80 divisors (see below), whose sum is σ = 1872499200. Its totient is φ = 216362880.

The previous prime is 686871853. The next prime is 686871901. The reversal of 686871888 is 888178686.

It is a congruent number.

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, 520093 + ... + 521411.

It is an arithmetic number, because the mean of its divisors is an integer number (23406240).

Almost surely, 2^686871888 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 686871888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936249600).

686871888 is an abundant number, since it is smaller than the sum of its proper divisors (1185627312).

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

686871888 is a wasteful number, since it uses less digits than its factorization.

686871888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1914 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 60.

The square root of 686871888 is about 26208.2408413842. The cubic root of 686871888 is about 882.3182196136.

The spelling of 686871888 in words is "six hundred eighty-six million, eight hundred seventy-one thousand, eight hundred eighty-eight".