685109340 has 144 divisors (see below), whose sum is σ = 2229907680. Its totient is φ = 176359680.

The previous prime is 685109291. The next prime is 685109377. The reversal of 685109340 is 43901586.

685109340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 685109295 and 685109304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138510 + ... + 143370.

It is an arithmetic number, because the mean of its divisors is an integer number (15485470).

Almost surely, 2^685109340 is an apocalyptic number.

685109340 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 685109340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114953840).

685109340 is an abundant number, since it is smaller than the sum of its proper divisors (1544798340).

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

685109340 is a wasteful number, since it uses less digits than its factorization.

685109340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914 (or 4900 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 685109340 is about 26174.5934065842. The cubic root of 685109340 is about 881.5628821097.

The spelling of 685109340 in words is "six hundred eighty-five million, one hundred nine thousand, three hundred forty".