685420200 has 144 divisors (see below), whose sum is σ = 2314969020. Its totient is φ = 181739520.

The previous prime is 685420189. The next prime is 685420243. The reversal of 685420200 is 2024586.

685420200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 83503044 + 601917156 = 9138^2 + 24534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 346414 + ... + 348386.

Almost surely, 2^685420200 is an apocalyptic number.

685420200 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 685420200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157484510).

685420200 is an abundant number, since it is smaller than the sum of its proper divisors (1629548820).

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

685420200 is a wasteful number, since it uses less digits than its factorization.

685420200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 685420200 is about 26180.5309342649. The cubic root of 685420200 is about 881.6961947476.

Adding to 685420200 its reverse (2024586), we get a palindrome (687444786).

The spelling of 685420200 in words is "six hundred eighty-five million, four hundred twenty thousand, two hundred".