686744080 has 80 divisors (see below), whose sum is σ = 1752637824. Its totient is φ = 248176640.

The previous prime is 686744057. The next prime is 686744089. The reversal of 686744080 is 80447686.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (686744089) 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 15 ways as a sum of consecutive naturals, for example, 144624 + ... + 149296.

Almost surely, 2^686744080 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 686744080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876318912).

686744080 is an abundant number, since it is smaller than the sum of its proper divisors (1065893744).

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

686744080 is a wasteful number, since it uses less digits than its factorization.

686744080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864 (or 4858 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 686744080 is about 26205.8024109166. The cubic root of 686744080 is about 882.2634911535.

The spelling of 686744080 in words is "six hundred eighty-six million, seven hundred forty-four thousand, eighty".