685159680 has 144 divisors (see below), whose sum is σ = 2208991680. Its totient is φ = 180977664.

The previous prime is 685159669. The next prime is 685159681. The reversal of 685159680 is 86951586.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685159681) 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, 433131 + ... + 434709.

It is an arithmetic number, because the mean of its divisors is an integer number (15340220).

Almost surely, 2^685159680 is an apocalyptic number.

685159680 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 685159680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104495840).

685159680 is an abundant number, since it is smaller than the sum of its proper divisors (1523832000).

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

685159680 is a wasteful number, since it uses less digits than its factorization.

685159680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 685159680 is about 26175.5550084425. Note that the first 3 decimals coincide. The cubic root of 685159680 is about 881.5844732076.

The spelling of 685159680 in words is "six hundred eighty-five million, one hundred fifty-nine thousand, six hundred eighty".