685558160 has 80 divisors (see below), whose sum is σ = 1829990016. Its totient is φ = 233969664.

The previous prime is 685558157. The next prime is 685558169. The reversal of 685558160 is 61855586.

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

It is not an unprimeable number, because it can be changed into a prime (685558169) 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, 124424 + ... + 129816.

Almost surely, 2^685558160 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 685558160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914995008).

685558160 is an abundant number, since it is smaller than the sum of its proper divisors (1144431856).

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

685558160 is a wasteful number, since it uses less digits than its factorization.

685558160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640 (or 5634 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The square root of 685558160 is about 26183.1655840160. The cubic root of 685558160 is about 881.7553461250.

The spelling of 685558160 in words is "six hundred eighty-five million, five hundred fifty-eight thousand, one hundred sixty".