685171560 has 64 divisors (see below), whose sum is σ = 2069182080. Its totient is φ = 181497600.

The previous prime is 685171537. The next prime is 685171561. The reversal of 685171560 is 65171586.

685171560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (39) 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 (685171561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787 + ... + 37026.

It is an arithmetic number, because the mean of its divisors is an integer number (32330970).

Almost surely, 2^685171560 is an apocalyptic number.

685171560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685171560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034591040).

685171560 is an abundant number, since it is smaller than the sum of its proper divisors (1384010520).

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

685171560 is a wasteful number, since it uses less digits than its factorization.

685171560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37978 (or 37974 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 685171560 is about 26175.7819367445. The cubic root of 685171560 is about 881.5895684496.

The spelling of 685171560 in words is "six hundred eighty-five million, one hundred seventy-one thousand, five hundred sixty".