685302240 has 144 divisors (see below), whose sum is σ = 2511229392. Its totient is φ = 156635136.

The previous prime is 685302239. The next prime is 685302251. The reversal of 685302240 is 42203586.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 685302198 and 685302207.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8952 + ... + 38088.

It is an arithmetic number, because the mean of its divisors is an integer number (17439093).

Almost surely, 2^685302240 is an apocalyptic number.

685302240 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 685302240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1255614696).

685302240 is an abundant number, since it is smaller than the sum of its proper divisors (1825927152).

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

685302240 is a wasteful number, since it uses less digits than its factorization.

685302240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29169 (or 29154 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 685302240 is about 26178.2780182349. The cubic root of 685302240 is about 881.6456122241.

The spelling of 685302240 in words is "six hundred eighty-five million, three hundred two thousand, two hundred forty".